Bank data is incomplete (Bank country &1, bank key &2)

What causes this issue?

The bank data (bank country &V1& and bank key &V2&) in the payment
document (application component &V3&, document number &V4&) is
incomplete. This data is required to ensure that the payment medium is
error-free.

How to fix this error?

Maintain the address, the name, and if possible the SWIFT Code of the
bank in <DS:TRAN.FI02>Maintaining bank data</>.

Error message extract from SAP system. Copyright SAP SE.