Solution : https://service.sap.com/sap/support/notes/549843 (SAP Service marketplace login required)
Key words :
create data type bapitech, enter technical fields, 'technical header field', tab page 'import', no_price_form_po component type, function module bapi_po_create, function module 'bapi_po_create', select indicator 'optional', no_messaging component type, no_message_req component type
Related Notes :
| 439110 | Enjoy PO BAPI: Conditions |