DMEE fetch records for IBAN or Bank account number at the same field

Hi Experts,

I am doing some development for Singapore Bank's DME where in IBAN number of the EU vendor to be populated.

I know the structure & Field name to be populated.  However, the case is we need to populate IBAN number for EV vendors and Bank acccount number for other vendors.

The business uses same payment method for both scenarios.

Can some one please help me what condition I shall put in order to differentiate the IBAN & Bank account number?

Regards,

BSK