SAP Function Module search on FM_PO
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FMFPO_WRITE_DOCUMENT - CHDO FMFPO => Gen. by RSSCD000
FM_POPULATE_XREF - Populate MM document reference for FM Update
FM_POPULATE_XREF2 - Populate XREF2 to ACCIT if required in FM
FM_POP_DERIVE - FM Account Derive
FM_POP_UPDATE_PO_HISTORY - FM update principle of prudence
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