Solution : https://service.sap.com/sap/support/notes/66757 (SAP Service marketplace login required)
Key words :
line 'ioheader projn' save start report, prerequisites solution start report, line 'ioheader projn_aufk' save, additional key words co26, production order information system, ioheader maintenance language, ioheader execute set, order header, order category, wbs element