U03 - Invalid IBAN Format | SWIFT Error Fix

Problem Description

The U03 error is triggered when the provided account number does not conform to standard IBAN structure for the destination country.

How to Fix It

Verify the country code and checksum of the IBAN in field 59. In MX (pacs.008), this must be strictly formatted under the CreditorAccount <Id><IBAN> element.

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