The Partner/Customer tin marque the desired changes to a record operation utilizing the Payment Flexibility tool. However, the Standard SAP delivered format cannot beryllium edited, but it has to beryllium recreated from scratch.
You tin specify your ain Payment File Format if the SAP modular record format is not supported. For much information, delight cheque the SAP Help Documents links provided below:
Create a New Payment File Structure | SAP Help Portal
Creating User-Defined Payment File Formats | SAP Help Portal
You tin measure the feasibility of editing the outbound record (generated with modular outgo structure) via a customized add/PDI.
From the Studio, it is imaginable to update the record contented of the generated record done the pursuing path: CompanyPaymentFileRegister (BO) --> OutgoingFile (Node) --> OutgoingFileAttachmentFolder (Node) --> Document (Node) --> FileContent (node) --> BinaryObject
Please notation to the KBA https://me.sap.com/notes/3146113