Solution : https://service.sap.com/sap/support/notes/439755 (SAP Service marketplace login required)
Key words :
maintain function module exit_saplmewp_002, function module bapi_po_create, customer function '002', function builder, purchase order, delivery address, createfromdata reason, program error, transaction se37, table parameter
Related Notes :
| 489310 | BAPI_PO_CREATE: PO_HEADER in user exit "002" |
| 358741 | BBP - R/3 delivery address |