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Lambda uses CargoWise accounting evidence to express one payment across the payment currency, each parent document currency, and the MXN value recorded at payment time.

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Terms

For a cross-currency parent:
The payment-time MXN allocation connects both sides of the calculation. Lambda does not invent a rate from current market data.

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Precision

Intermediate comparisons allow one minor unit when rounding order can differ. After stamping, Lambda verifies the returned complement against the reconciled values.

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Same currency

A receipt pays MXN 1,800 against an MXN parent. No conversion is needed.

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USD payment against an MXN parent

A USD 100 receipt is valued at MXN 18.00 per USD and applies MXN 1,800 to an MXN parent.
The REP uses TipoCambioP = 18.000000 and EquivalenciaDR = 18.0000000000.

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USD payment against a EUR parent

A USD 100 receipt is valued at MXN 18.00 per USD. It applies MXN 1,800 to EUR 90 of a EUR parent.
The REP uses TipoCambioP = 18.000000 and EquivalenciaDR = 0.9000000000.

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Missing or conflicting evidence

Lambda stops before issuance when:
  • payment exchange-rate evidence is missing or invalid
  • applied MXN is missing or invalid
  • parent currency conflicts with the stamped parent
  • the derived payment amount disagrees with receipt totals
  • the stamped complement differs from the reconciled values
The workspace finding names the affected parent and the safe observed values. See Payments for the complete REP behavior.