SAP Function Module search on RV_PB
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RV_PBD_ITEMS_ADD - Add a document/items to an existing prelimary billing document
RV_PBD_MAN_ITEM_ADD - Add a document/items to an existing prelimary billing document
RV_PBD_REJECT - Reject preliminary billing documents
RV_PBD_STATUS_DETERMINE - Determine PBD Status of one instance
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