What is the process to create a repayment request for an open credit that is already on a customer account (is not on sitting on clarification)?.
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repayment function in FICA is used when no customer is identified and money should be returned. Otherwise if customer is identified then it is a refund processed with outgoing payment method via FPE2 or FPCRPO.
You can use the payment specification functionality (FPAY1A) to group the open credit items sittng on the account and mark them with the refund payment method.
Then you can execute the FPY1 for the payment method to pck them up and issue the refund.
Hope it helps..