Use below BAPI to create return po from third party App through API. BAPI: BAPI_PO_CREATE1 INPUT PARAMETER: POHEADER COMP_CODE Dynamic (1000/2000) DOC_TYPE ZRNB VENDOR Based on req. PURCH_ORG ALLP PUR_GROUP Dynamic (001/002/003/004/005/006 POHEADERX COMP_CODE X DOC_TYPE X VENDOR X PURCH_ORG X PUR_GROUP X POITEM PO_ITEM 00010 MATERIAL Based on requirement PLANT D001 STGE_LOC 0001 QUANTITY 100 PO_UNIT EA NET_PRICE 40 PRICE_UNIT 1 ORDERPR_UN EA R...