Solution : https://service.sap.com/sap/support/notes/663648 (SAP Service marketplace login required)
Key words :
back-end purchase order, enterprise buyer professional, sap enterprise buyer, srm standard system, prerequisites field header_add_data_relevant, fill structure po_header_add_data, set field header_add_data_relevant, purchase order, field header_add_data_relevant, field header_add_data_relevant '1'
Related Notes :
| 663913 | PO_HEADER_ADD_DATA results in errors in back-end system |
| 394923 | PO_HEADER_ADD_DATA in BAdI BBP_CREATE_PO_BACK: error in BE |