3778197 - Unable to update the payment method for an already executed payment.

There is a need to change the payment method for an already executed payment, however it is not possible to modify it directly in the UI.

SAP Business ByDesign 

1. Go to Payment Management work center, Payment Monitor view.
2. Change the filter if needed.
3. Search for ABC (ABC refers to the ID of the already executed Payment).
     - Select it and press 'Edit'.
     - Or press the Document ID ABC, then press View All.
4. There is no option to modify the payment method.

This is the expected system behavior, as the system determines the payment method at payment proposal/payment creation time based on payment strategy and payment information.

1. If a payment or payment proposal has been already executed with an incorrect payment method, cancel/undo or reverse the executed proposal/payment.
2. Correct the source payment method where it is derived (for example, in relevant configuration or business partner payment information).
3. Recreate the item: rerun the payment run to generate a new proposal/payment or create a manual outgoing payment using the correct payment method.
   
   Note: there is no standard background run to mass update the payment method on already executed payment or proposal records. Enhancements can only influence derivation at creation time.
   
   While a record is still a payment proposal (not yet posted as a payment), the payment method can be edited manually.

Create and Edit Payment Proposals for Receivables | Help Portal

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