Solution : https://service.sap.com/sap/support/notes/515490 (SAP Service marketplace login required)
Key words :
data type tekko » component, data type bapiekkoa, terms ekko-unsez, data types bapiekkoa, our_ref » component type, unsez » component type, create purchase orders, bapiekkoa reason, purchase order, reference' field
Related Notes :
| 431008 | BAPI_PO_CREATE: validity start/end is missing |