# How Do Courts Treat Manifest Errors in a Close-Out Amount Calculation Notice? ▴ Question

**Published:** 2025-08-22
**Categories:** Question

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## Concept

The [close-out amount](https://prime.greeks.live/area/close-out-amount/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) calculation notice functions as the final economic reckoning point in a terminated derivatives contract. It is the mechanism that crystallizes the net financial obligation between two parties following an event of default or a [termination event](https://prime.greeks.live/area/termination-event/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite). The integrity of this process is paramount; it underpins the stability of the entire over-the-counter derivatives market by providing a clear, predictable, and enforceable method for settling outstanding exposures. A manifest error within this notice ▴ an obvious, indisputable mistake in calculation ▴ represents a critical failure point in this system.

It introduces ambiguity and potential for dispute into what must be a definitive financial statement, challenging the very finality the mechanism is designed to achieve. Understanding the judicial treatment of such errors is therefore an exercise in appreciating the balance courts must strike between upholding [contractual finality](https://prime.greeks.live/area/contractual-finality/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) and ensuring equitable, accurate outcomes.

> A manifest error in a close-out calculation is not merely a transactional hiccup; it is a direct challenge to the structural integrity of the derivatives settlement process.

Courts approach this challenge with a clear bias toward preserving the original determination, viewing the notice as a significant and binding contractual event. The judicial system does not treat the discovery of an error as an invitation to nullify the entire calculation process. Instead, it initiates a precise and contained intervention. The legal framework, particularly as it has evolved around the [ISDA Master Agreement](https://prime.greeks.live/area/isda-master-agreement/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite), distinguishes sharply between errors that require a simple correction and those fundamental flaws that might necessitate a more comprehensive re-evaluation.

This distinction is the core principle guiding judicial review. A simple, demonstrable mathematical slip is handled with surgical precision, while a profound misinterpretation of the underlying agreement might warrant a broader examination. The system is engineered to correct, not to invalidate, preserving the momentum of the close-out process while ensuring the final figure is a true and fair representation of the parties’ obligations.

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## The Principle of Binding Finality

Upon the delivery of a close-out notice, a debt obligation is legally established. This act is not a preliminary calculation or a negotiable starting point; it is a definitive statement of account that alters the legal relationship between the counterparties. The courts have consistently reinforced the idea that this event is, for the most part, irreversible. A [determining party](https://prime.greeks.live/question/what-is-the-role-of-the-calculating-party-in-determining-the-final-settlement-amount/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) cannot unilaterally retract a notice and issue a new one simply because it has discovered a mistake or reconsidered its methodology.

This principle of finality is a cornerstone of market stability. It ensures that counterparties can rely on the figures provided and manage their own risk and liquidity accordingly. The market’s operational tempo depends on the certainty that these notices, once issued, are binding declarations. Any judicial intervention must therefore be carefully calibrated to respect this finality, addressing the specific error without reopening the entire valuation process.

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## Defining a Manifest Error

For an error to be considered “manifest,” it must be apparent on the face of the document or through a straightforward review of the underlying calculations. This is a high standard. The term implies a mistake that is obvious, plain, and indisputable, such as a clear mathematical miscalculation, a typographical error in a key input, or the demonstrable omission of a required component of the calculation.

It does not typically extend to disagreements over discretionary aspects of the valuation, such as the choice of a particular valuation model or the assessment of “[commercial reasonableness](https://prime.greeks.live/area/commercial-reasonableness/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite),” unless the chosen method is so flawed as to be indefensible. The burden of proof lies with the party alleging the error, and they must demonstrate that the mistake is not a matter of opinion or judgment but a clear, objective flaw in the arithmetic or the application of the agreed-upon formula.

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## Strategy

The strategic framework for addressing a [manifest error](https://prime.greeks.live/area/manifest-error/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) in a close-out amount calculation is governed by a central judicial principle ▴ correction over nullification. When a court confronts a calculation notice containing a demonstrable error, its primary objective is to rectify the specific mistake, not to discard the entire determination. This judicial preference establishes a clear strategic path for the involved parties. The party identifying the error must frame its challenge as a request for a precise, targeted adjustment.

Conversely, the determining party must be prepared to defend the integrity of its overall methodology while acknowledging the possibility of a specific, correctable flaw. The legal strategy is one of surgical intervention rather than wholesale invalidation. This approach preserves the contractual finality of the notice while ensuring the ultimate financial settlement is accurate.

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## Judicial Doctrines Guiding Intervention

The courts have developed a consistent doctrine for handling these disputes, heavily influenced by key rulings concerning the ISDA [Master Agreement](https://prime.greeks.live/question/how-does-the-isda-master-agreements-single-agreement-clause-function-in-practice/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite). The prevailing view is that a validly made determination, even one containing a manifest error, fulfills the determining party’s contractual obligation to calculate the close-out amount. The notice itself is not voided. Instead, the error creates a right for the aggrieved party to seek a correction, either through mutual agreement or, failing that, through a judicial ruling.

The court then steps in to declare what the close-out amount would have been had the error not occurred. This process treats the [original notice](https://prime.greeks.live/question/how-does-the-dodd-frank-act-alter-the-original-rationale-for-bankruptcy-safe-harbors/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) as a fundamentally sound document that requires a specific amendment. Any revised calculation submitted by a party after the fact is not a new, valid determination but is treated merely as evidence for the court to consider in its own assessment of the correct figure.

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## Comparative Treatment of Calculation Flaws

The court’s response is calibrated to the nature of the error. A clear distinction is made between simple numerical mistakes and more profound methodological failures. This distinction is critical for shaping a party’s legal strategy, as it dictates the scope of the potential judicial remedy.

| Type of Error | Typical Judicial Treatment | Strategic Implication for Litigants |
| --- | --- | --- |
| Manifest Mathematical or Numerical Error | Correction of the specific error by the court. The original determination remains binding, but the final amount is adjusted. | Focus litigation on proving the specific, objective mistake and quantifying its precise impact on the final calculation. |
| Omission of a Required Component | Inclusion of the omitted component and recalculation of the final amount. This is generally treated as a correctable error. | Provide clear evidence of the contractual requirement to include the component and its quantifiable value. |
| Misinterpretation of the Agreement | Potential for a broader review of the calculation. If the misinterpretation is fundamental, it may invalidate the determination, allowing a fresh one. | Argue the fundamental nature of the misinterpretation and how it renders the entire calculation commercially unreasonable. |
| Failure to Use Commercially Reasonable Procedures | The court may substitute its own calculation based on an objective standard of commercial reasonableness. | Present expert testimony and market data to demonstrate how the determining party’s procedures deviated from objective industry standards. |

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## Procedural Steps in Disputing a Calculation

A party that identifies a potential manifest error in a close-out notice should follow a structured and methodical process. The immediate goal is to preserve legal rights while seeking an efficient resolution. The following steps outline a robust strategic approach:

- **Immediate Notification** ▴ Upon discovering a potential error, the aggrieved party should promptly notify the determining party in writing. This communication should clearly and specifically identify the alleged error, provide supporting evidence or calculations, and state the party’s view of the correct amount.

- **Attempt at Mutual Agreement** ▴ The most efficient resolution is a bilaterally agreed-upon correction. The parties should engage in good-faith negotiations to resolve the discrepancy without resorting to litigation. Courts favor this approach, as it aligns with the commercial nature of the underlying transaction. 

- **Formal Dispute Resolution** ▴ If an agreement cannot be reached, the aggrieved party must invoke the dispute resolution mechanism specified in the master agreement. This typically involves initiating legal proceedings in the contractually stipulated jurisdiction.

- **Gathering of Evidence** ▴ The core of the legal case will be the evidence demonstrating the manifest error. This includes the original notice, the relevant contractual clauses, detailed recalculations, and potentially expert witness testimony on market conventions or valuation methodologies.

- **Pleading for Correction** ▴ In its legal filings, the plaintiff should petition the court to correct the manifest error and issue a judgment for the accurate close-out amount. The legal argument should emphasize the principle of correction over redetermination, aligning with judicial precedent.

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## Execution

The execution of a legal challenge to a manifest error in a close-out amount notice is a highly structured process, grounded in the objective analysis of financial data and contractual obligations. The litigation process moves from the identification of a specific, quantifiable error to a judicial determination of the correct financial outcome. Success in this arena depends on the ability to present a clear, evidence-based argument that aligns with the judiciary’s preference for precise correction rather than wholesale redetermination. The entire exercise is an application of quantitative analysis within a strict legal framework, where the court acts as the ultimate arbiter of the calculation’s accuracy and commercial reasonableness.

> The judicial execution of a manifest error claim involves substituting a flawed data point with a correct one, preserving the integrity of the original calculation framework.

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## The Judicial Process for Error Correction

When a dispute over a manifest error reaches the courtroom, the proceedings follow a predictable path. The court’s role is not to create a new close-out amount from scratch but to adjudicate the validity of the [original calculation](https://prime.greeks.live/question/how-does-the-dodd-frank-act-alter-the-original-rationale-for-bankruptcy-safe-harbors/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) and make a specific, targeted correction. This process is designed to be efficient and to provide a definitive resolution, reinforcing the market’s need for certainty.

| Phase of Litigation | Key Actions and Objectives | Evidence Required |
| --- | --- | --- |
| Pleadings | The plaintiff files a claim specifying the manifest error. The defendant responds, either defending the original calculation or conceding the error. | The close-out notice, the ISDA Master Agreement, and initial calculations showing the alleged error. |
| Discovery | Both parties exchange information and documents relevant to the calculation. This may include internal valuation models, market data, and communications. | Internal emails, valuation reports, third-party quotes, and data from financial information providers. |
| Expert Testimony | Each side may engage financial experts to provide testimony on the commercial reasonableness of the procedures used or the correct application of a valuation model. | Expert reports detailing industry standards, alternative calculations, and opinions on the validity of the methodology. |
| Summary Judgment | A party may move for summary judgment if the error is purely mathematical and there is no genuine dispute of material fact. | Affidavits and documentary evidence establishing the error as a matter of law. |
| Trial | If facts are in dispute, the court hears testimony and reviews evidence to determine the existence and magnitude of the error. | Live testimony from fact and expert witnesses, cross-examination, and presentation of all documentary evidence. |
| Judgment | The court issues a ruling that either upholds the original calculation or, more commonly, declares the correct close-out amount after correcting the error. | The final court order specifying the corrected payment obligation. |

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## Hypothetical Case Study Application

To illustrate the practical application of these principles, consider a scenario based on the precedents set in cases like Lehman Brothers v. National Power Corporation. 

A corporation, Party A, terminates a swap agreement with a bank, Party B, following an event of default. Party B, as the determining party, issues a close-out amount notice stating that Party A owes $5.2 million. Party A’s internal team reviews the notice and discovers that Party B omitted an accrued interest payment of $750,000 that was owed to Party A. This omission is a clear, manifest error.

- **Initial Action** ▴ Party A immediately notifies Party B in writing, presenting its calculation that shows the correct amount owed by Party A should be $4.45 million ($5.2 million – $750,000).

- **Dispute** ▴ Party B refuses to amend the notice, arguing that its overall valuation methodology was commercially reasonable and the final figure is binding.

- **Litigation** ▴ Party A initiates legal proceedings. In court, it does not argue that Party B’s entire valuation is invalid. Instead, it focuses exclusively on the manifest error of the omitted interest payment.

- **Court’s Decision** ▴ The court, following established precedent, would likely rule that the omission of the accrued interest was a manifest error that requires correction. It would not permit Party B to submit a completely new redetermination of the close-out amount. The court’s judgment would be to correct the original notice, declaring that the proper amount payable by Party A is $4.45 million. This outcome upholds the finality of the original notice while ensuring the accuracy of the final payment.

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## References

- High Court clarifies calculation of Close-out amount under 2002 ISDA Master Agreement. (2018). Linklaters.

- Close-Out Amount Calculations Under 2002 ISDA – The National Law Review. (2018). The National Law Review.

- High Court restricts re-calculation of termination amount and interprets Close-out Amount under ISDA Master Agreement. (2018). Allen & Overy.

- Derivatives Laws and Regulations Close-out Under the 1992 and 2002 ISDA Master Agreements 2025. (2025). ICLG.com.

- ISDA Close-out Amount Protocol. (n.d.). International Swaps and Derivatives Association.

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## Reflection

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## Calibrating Contractual Systems for Certainty

The judicial treatment of manifest errors in close-out calculations provides a critical insight into the design of robust financial systems. The legal framework is not merely a dispute resolution mechanism; it is a system-level protocol designed to handle exceptions without causing a cascade failure. It prioritizes the operational integrity of the market by treating a flawed calculation not as a void event, but as a state that requires a defined, limited correction. This approach contains the blast radius of an error, ensuring that a single point of failure does not undermine the entire structure of a complex financial settlement.

For institutions, this judicial philosophy underscores the importance of designing internal processes and contractual agreements that are not only precise in their initial execution but also resilient in their ability to accommodate and correct for inevitable human or operational error. The ultimate goal is a system that is self-correcting, predictable, and, above all, final.

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## Glossary

<a href="https://prime.greeks.live/area/termination-event/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Termination Event

Meaning ▴ A Termination Event denotes a pre-specified condition or set of criteria, contractually defined or algorithmically encoded, whose verified occurrence mandates the immediate cessation or unwinding of a financial agreement, especially prevalent within institutional digital asset derivatives. </a><a href="https://prime.greeks.live/area/close-out-amount/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Close-Out Amount

Meaning ▴ The Close-Out Amount represents the definitive financial value required to terminate a derivatives contract or position, typically calculated upon a default event or a pre-defined termination trigger. </a><a href="https://prime.greeks.live/area/contractual-finality/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Contractual Finality

Meaning ▴ Contractual finality signifies the precise moment when all terms, conditions, and obligations within a digital asset derivatives agreement become absolutely immutable and legally binding. </a><a href="https://prime.greeks.live/area/isda-master-agreement/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Isda Master Agreement

Meaning ▴ The ISDA Master Agreement is a standardized contractual framework for privately negotiated over-the-counter (OTC) derivatives transactions, establishing common terms for a wide array of financial instruments. </a><a href="https://prime.greeks.live/question/what-is-the-role-of-the-calculating-party-in-determining-the-final-settlement-amount/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Determining Party

The Calculating Party is the contractually designated entity that determines a derivative's value, ensuring precise financial settlement. </a><a href="https://prime.greeks.live/area/commercial-reasonableness/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Commercial Reasonableness

Meaning ▴ Commercial reasonableness refers to the standard by which a transaction or action is judged to be consistent with prevailing market practices, industry norms, and sound business judgment, particularly concerning pricing, terms, and execution methodology. </a><a href="https://prime.greeks.live/area/manifest-error/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Manifest Error

Meaning ▴ A clear, undeniable, and objectively verifiable error in data, pricing, or system operation immediately apparent without subjective interpretation. </a><a href="https://prime.greeks.live/question/how-does-the-isda-master-agreements-single-agreement-clause-function-in-practice/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Master Agreement

The ISDA's Single Agreement clause is a legal protocol that unifies all transactions into one contract to enable enforceable close-out netting. </a><a href="https://prime.greeks.live/question/how-does-the-dodd-frank-act-alter-the-original-rationale-for-bankruptcy-safe-harbors/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Original Notice

Dodd-Frank alters bankruptcy safe harbors by creating a centralized resolution authority that supplants their primary systemic risk rationale. </a><a href="https://prime.greeks.live/question/how-does-the-dodd-frank-act-alter-the-original-rationale-for-bankruptcy-safe-harbors/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Original Calculation

Dodd-Frank alters bankruptcy safe harbors by creating a centralized resolution authority that supplants their primary systemic risk rationale. </a>

**Tags:** [Manifest Error](https://options.greeks.live/area/manifest-error/), [2002 ISDA Master Agreement](https://options.greeks.live/area/2002-isda-master-agreement/), [Contractual Finality](https://options.greeks.live/area/contractual-finality/), [Close-Out Amount](https://options.greeks.live/area/close-out-amount/), [Termination Event](https://options.greeks.live/area/termination-event/), [Financial Dispute Resolution](https://options.greeks.live/area/financial-dispute-resolution/)	

## Discover More

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### [What Constitutes a Commercially Reasonable Procedure in a Close-Out Scenario?](https://options.greeks.live/question/what-constitutes-a-commercially-reasonable-procedure-in-a-close-out-scenario/)
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A commercially reasonable procedure is a defensible, objective process for valuing terminated derivatives to ensure a fair and equitable settlement.

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### [Can a Determining Party Revise Its Close out Calculation after It Has Been Issued?](https://options.greeks.live/question/can-a-determining-party-revise-its-close-out-calculation-after-it-has-been-issued/)
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A Determining Party cannot unilaterally revise an issued close-out calculation; its finality ensures contractual certainty.

- 
### [What Constitutes a Force Majeure Termination Event under the 2002 ISDA Master Agreement?](https://options.greeks.live/question/what-constitutes-a-force-majeure-termination-event-under-the-2002-isda-master-agreement/)
![Precision cross-section of an institutional digital asset derivatives system, revealing intricate market microstructure. Toroidal halves represent interconnected liquidity pools, centrally driven by an RFQ protocol. This Prime RFQ architecture enables high-fidelity execution, optimizing multi-leg spread strategies and capital efficiency.](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-prime-os-architecture-revealing-precision-rfq-protocol-engine-for-optimal-high-fidelity-execution-and-latent-liquidity-aggregation.jpg)

A Force Majeure Event is a no-fault termination protocol for impossible performance due to external shocks.

- 
### [How Do Unpaid Amounts Affect the Final Calculation of an Early Termination Amount?](https://options.greeks.live/question/how-do-unpaid-amounts-affect-the-final-calculation-of-an-early-termination-amount/)
![Sleek, dark grey mechanism, pivoted centrally, embodies an RFQ protocol engine for institutional digital asset derivatives. Diagonally intersecting planes of dark, beige, teal symbolize diverse liquidity pools and complex market microstructure. This highlights high-fidelity execution, price discovery, and atomic settlement via Prime RFQ for block trades.](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-protocol-engine-powering-high-fidelity-execution-for-multi-leg-spreads-portfolio-margin-and-atomic-settlement-via-prime-os-for-block-trades.jpg)

Unpaid Amounts are netted against the portfolio's replacement value to ensure a complete and final financial reconciliation.

- 
### [What Are the Key Differences in Force Majeure Treatment between the 1992 and 2002 ISDA Masters?](https://options.greeks.live/question/what-are-the-key-differences-in-force-majeure-treatment-between-the-1992-and-2002-isda-masters/)
![A sleek, dark, metallic system component features a central circular mechanism with a radiating arm, symbolizing precision in High-Fidelity Execution. This intricate design suggests Atomic Settlement capabilities and Liquidity Aggregation via an advanced RFQ Protocol, optimizing Price Discovery within complex Market Microstructure and Order Book Dynamics on a Prime RFQ.](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-prime-os-high-fidelity-execution-protocol-liquidity-market-microstructure.jpg)

The 2002 ISDA integrates a Force Majeure Termination Event, a structured protocol absent from the 1992 version.

- 
### [How Does the Force Majeure Clause in the 2002 ISDA Agreement Function during a Market Crisis?](https://options.greeks.live/question/how-does-the-force-majeure-clause-in-the-2002-isda-agreement-function-during-a-market-crisis/)
![Two off-white elliptical components separated by a dark, central mechanism. This embodies an RFQ protocol for institutional digital asset derivatives, enabling price discovery for block trades, ensuring high-fidelity execution and capital efficiency within a Prime RFQ for dark liquidity.](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-protocol-engine-4.jpg)

The 2002 ISDA Force Majeure clause provides a controlled, no-fault termination path for derivatives during a systemic crisis.

- 
### [How Does the Force Majeure Clause in the 2002 Isda Agreement Impact Termination Events?](https://options.greeks.live/question/how-does-the-force-majeure-clause-in-the-2002-isda-agreement-impact-termination-events/)
![A central teal column embodies Prime RFQ infrastructure for institutional digital asset derivatives. Angled, concentric discs symbolize dynamic market microstructure and volatility surface data, facilitating RFQ protocols and price discovery. Small fasteners denote precise atomic settlement and high-fidelity execution.](https://options.greeks.live/wp-content/uploads/2025/07/digital-asset-derivatives-rfq-protocol-alpha-generation-execution.jpg)

The 2002 ISDA Force Majeure clause provides a structured protocol for terminating trades during severe external disruptions.

- 
### [How Does the Waiting Period in the 2002 Isda Agreement Function?](https://options.greeks.live/question/how-does-the-waiting-period-in-the-2002-isda-agreement-function/)
![A sophisticated, illuminated device representing an Institutional Grade Prime RFQ for Digital Asset Derivatives. Its glowing interface indicates active RFQ protocol execution, displaying high-fidelity execution status and price discovery for block trades. The design suggests robust market microstructure and capital efficiency.](https://options.greeks.live/wp-content/uploads/2025/07/principal-rfq-engine-for-digital-asset-derivatives-best-execution-1.jpg)

The 2002 ISDA Waiting Period is a systemic buffer, providing a brief, defined window to cure payment failures before default can be declared.

- 
### [How Did the 2002 ISDA Master Agreement Change the Close out Calculation Process?](https://options.greeks.live/question/how-did-the-2002-isda-master-agreement-change-the-close-out-calculation-process/)
![A sleek, two-part system, a robust beige chassis complementing a dark, reflective core with a glowing blue edge. This represents an institutional-grade Prime RFQ, enabling high-fidelity execution for RFQ protocols in digital asset derivatives.](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-protocol-execution-microstructure-3.jpg)

The 2002 ISDA Master Agreement replaced subjective loss assessment with an objective, two-part test of commercial reasonableness.

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---

**Original URL:** https://options.greeks.live/question/how-do-courts-treat-manifest-errors-in-a-close-out-amount-calculation-notice/
