Message type: E = Error
Message class:  WRMA_CAT - RMA cost allocation 
Message number: 112
Message text: Allowed combination of payment type &1 and billing type &2 not maintained
The combination of payment type &V1& and billing type &V2& is not
maintained as allowed combination.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
When the user enters a settlement request for cost allocation, the
system does not prompt the user if they make an incorrect choice of
billing type of a wrong use case.
Maintain the <DS:SIMG.V_WRART_LFART>allowed combinations payment type /
billing type</>.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message: WRMA_CAT112 Allowed combination of payment type &1 and billing type &2 not maintained
Cause: This error occurs in SAP when the system checks the allowed combinations of Payment Type and Billing Type during the processing of a billing document or related transaction (often in the context of Returns Management, Service Management, or Sales Billing). The combination of the payment type (e.g., cash, credit card, invoice) and the billing type (e.g., invoice, credit memo, debit memo) being used is not defined or maintained in the system configuration. In other words, SAP expects that for a given billing type, only certain payment types are allowed, and the current combination is missing in the customizing settings. Where does this happen? Typically during billing document creation or processing in Sales and Distribution (SD) or Returns Management. It can also occur in Service Management or Contract Billing scenarios where payment and billing types are tightly controlled.
Solution: You need to
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