| Business partner does not have post office bank details

What causes this issue?

The payment method requires post office bank details. This is defined
with the <LS>Post office bank account</> indicator in the individual
country definitions for payment method.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Enter the missing specifications in the business partner master record,
provided the payment method definition is correct.

Error message extract from SAP system. Copyright SAP SE.