No G/L account has been specified for & /& for the bank

What causes this issue?

A specification has not been made in the system as to which G/L account
is to be posted to for the selected payment method and the specified
bank details.

How to fix this error?

Either specify a different payment method or a different bank if the
entries were not correct. Otherwise, specify the G/L account for
automatic payment transactions within bank selection customizing.

Error message extract from SAP system. Copyright SAP SE.