Solution : https://service.sap.com/sap/support/notes/529287 (SAP Service marketplace login required)
Key words :
prerequisites support package sapkh46c26 adds, symptom function module bapi_po_change, support package status, support package sapkh46c33, condition merge function, functional gap filled, function modules bapi_po_create1, price determination reason, existing purchase order, function modules
Related Notes :
| 571860 | BAPI_PO_CREATE1: Price is not transferred |
| 439110 | Enjoy PO BAPI: Conditions |