Solution : https://service.sap.com/sap/support/notes/942946 (SAP Service marketplace login required)
Key words :
attached source code corrections, extended classic scenario, original price information, price determination, purchase order, srm system, ecc system, terms purchaseorder, ekpo-netpr, ecc reason
Related Notes :
853970 | BAPI_PO_CREATE1: Net price is not transferred |