Search for the exact issue your operations team is seeing: MT103 and MT202 validation failures, pacs.008 conversion breaks, NACK responses, account detail rejects, and field-level parsing errors that can delay settlement.
Reduce settlement delays caused by invalid routing, settlement dates, and account detail mismatches.
Understand where legacy MT formats diverge from ISO 20022 pacs.008 and pacs.009 expectations.
Use the rejection reason and likely cause to guide your internal support and transformation workflow.
The T64 error appears when an institution or clearing code fails BIC validation in SWIFT MT formats, often causing payment rejection before the message reaches the receiving bank.
Common rejection reason
Invalid or unregistered BIC used for the ordering or intermediary institution.
The U03 error is triggered when the provided account number does not conform to standard IBAN structure for the destination country, causing account validation to fail.
Common rejection reason
Account identifier does not pass checksum, length, or country-specific IBAN rules.
The C03 error indicates a mismatch between the value date specified in the message and the allowed value date rules for the currency.
Common rejection reason
The settlement or value date does not meet the expected calendar or business-day rule.
A NACK response indicates the receiving system rejected the message at a structural or semantic level, often after a parser or schema validation step.
Common rejection reason
The receiving participant rejected the payload because one or more business or structural rules failed.
Schema mismatches occur when legacy MT blocks or field ordering do not align with the stricter ISO 20022 MX document structure, especially for MT103 and MT202 conversions.
Common rejection reason
The transformed message contains a field, nesting, or cardinality mismatch that violates the target MX schema.
Settlement rule errors happen when the payment instruction uses an unsupported settlement date, currency combination, or business-day rule.
Common rejection reason
The payment instruction does not meet the expected settlement calendar or currency processing rules.