Incorrect IBAN generation

IBAN code may be incorrectly generated when adding bank details to a BP supplier account (GESBPS function) in Sage X3. This occurs intermittently for suppliers with the country set to GB and IBAN control enabled.

The issue can be replicated in the SEED folder.

To ensure correct IBAN generation, the bank format setup must include the 4-character alphanumeric bank code prefix (e.g., MIDL) when IBAN management is enabled.

In the GESTCY function (Countries), the bank account correct format should be: 4A[-]2#[-]2#[-]2#[ ]8#

In the reported case, the customer was using: 2#[-]2#[-]2#[ ]8# — which omits the required 4A prefix.

This is a common oversight, as many customers do not include the 4-character bank code in their configuration. Updating the format to include the prefix resolves the issue.