Solution : https://service.sap.com/sap/support/notes/659386 (SAP Service marketplace login required)
Key words :
client tabname fieldname output_relevant 200 bbp_pdigp deliv_date, terms enterprise buyer professional edition, customer defined extensions reason, user-defined fields trigger, customer-defined fields, user-defined fields, prerequisites table bbpd_po_metaout, standard fields, table bbpd_po_metaout, table entries
Related Notes :
| 806127 | User-defined fields with XML communication |
| 494541 | User-defined fields in XML communication |
| 458591 | User-defined fields: Preparation and use |