Solution : https://service.sap.com/sap/support/notes/520559 (SAP Service marketplace login required)
Key words :
351syntax check error message, saplbbp_pu_addon include, lbbp_pu_addonf01 line, po_items-tax_code, cekpo-mwskz, data object, component called, terms lbbp_pu_addonf01, mwskz reason, support package
Related Notes :
| 509594 | Transferring the purchase order tax code to the back end |
| 505745 | BAPI_PO_CREATE: tax indicator (MWSKZ) now available |