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FX Delta PnL Explain can be handled using the logic for interpreting risk factors as currency pairs, either by directly defining the currency pair, such as CAD/USD, or by customizing the interpretation of risk factors, for example, CAD_FX Equivalent.

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Example scenario

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1. Input data: Sensitivity inputs

The sensitivity input data contains the following fields:
  • Risk Factor: Specifies the FX pair or equivalent representation for the sensitivity.
  • Value (Delta): The sensitivity of the Delta to changes in the FX rate.

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Example sensitivity input data:

Risk factorDelta
CAD/USD1000
CAD_FX Equivalent1500

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2. Logic for interpreting risk factors

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Case 1: Risk factor as a currency pair (preferred approach)

For a CAD/USD, the system interprets the risk factor as:
  • From Currency: CAD
  • To Currency: USD
The FX rate for CAD/USD is directly looked up from the FX Rate Market Data Store.

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Case 2: Risk Factor as an Equivalent (Customized Approach)

For CAD_FX Equivalent, the system customizes the interpretation to convert it into a currency pair:
  • From Currency: CAD
  • To Currency: USD
This mapping is achieved by using a customization layer (for example, the RiskFactorFXPairTranslatorConfig class in the code base, where you input a default To: currency). Atoti Market Risk then looks up the FX rate CAD/USD in the FX rate market data store.

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3. Calculating Delta PnL Explain

For each risk factor, the PnL explain is calculated as: PnL Explain=Delta×FX Rate Change(Absolute or Relative)\text{PnL Explain} = \text{Delta} \times \text{FX Rate Change(Absolute or Relative)}