SAP Function Module search on RV_CU
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RV_CUSTOMER_MATERIAL_INFO - Call on Customer-Material Inforecord Maintenance
RV_CUSTOMER_MATERIAL_PRE_READ - Read customer-material info record for pre-step
RV_CUSTOMER_MATERIAL_READ - Read customer-material info record for document processing
RV_CUSTOMER_MATERIAL_UPDATE - Update program for sales information data records
RV_CUSTOMER_MATERIAL_UPDATE_C - Posting program for customer-material info (CALL mode)
RV_CUSTOMER_MAT_AUTH_CHECK - Kunden-Material-Info Berechtigung prüfen
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