How to ensure billing can only used one time as reference to create credit memo request? In another word how to ensure only one billing with one credit memo request?
You can make your ow routine for copy control between credit request and billing document and not copy intems if subsequent document exist (you can check for aubsequent documents in VBFA table)
What do you mean by 1 billing for 1 credit memo request? If you want to refer credit memo request from billing doc, then in VOV8 in reference mandatory field select option M for reference to a billing doc. You cannot have multiple credit memos for 1 credit memo request in standard SAP.
Use MV45AFZZ program in ask your abap to Wright cone check reference before using document type credit memo for EG (CR) if find any other credit memo show as error
Or check it manually if that billing already having credit memo
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