The following documents were not processed since they will be sent by EDI

What causes this issue?

No payment medium was generated for the listed payment documents, since
the pre-defined method for transmitting the payment order for the house
bank and payment method in question is by EDI.

How to fix this error?

In future, before starting the payment medium program, you should start
program <DS:RE.RFFOEDI1>RFFOEDI1</>, which generates the EDI payment
orders.
If you start the EDI program now, check the log to ensure that all the
payments were transmitted by EDI.

Error message extract from SAP system. Copyright SAP SE.