Solution : https://service.sap.com/sap/support/notes/505745 (SAP Service marketplace login required)
Key words :
i_mwskz reference field/structure, create purchase orders, terms purchase order, poitems-tax_code reason, tax_code component type, function module me_create_po_item, data type bapiekpoc, ekpo-mwskz optional, structure bapiekpoc, ekpo-mwskzcreatefromdata
Related Notes :
| 520559 | Syntax error with PO_ITEMS-TAX_CODE |
| 509594 | Transferring the purchase order tax code to the back end |
| 507237 | SAPKU30009: Support Package 9 for EBP 3.0/CRM 3.0 |