Troubleshooting
Lambda needs exchange-rate or MXN-equivalent evidence before stamping.
Cross-currency payments need enough exchange-rate evidence to calculate the CFDI payment complement.
The payment, parent invoice, or match line involved different currencies, but Lambda could not prove the exchange rate, MXN equivalent, or EquivalenciaDR value.
Lambda does not invent exchange rates. For payment complements, a small exchange-rate difference can change the SAT balance chain.
Lambda needs the payment currency, parent document currency, exchange rate or MXN equivalent, and the amount paid for each related parent document.
When the exchange-rate detail is present and matches the payment, Lambda can retry reconciliation. If the expected and received values still differ, the note will keep showing the mismatch.