Solution : https://service.sap.com/sap/support/notes/100109 (SAP Service marketplace login required)
Key words :
attached source code corrections, additional key words co26, -stock component directly procured, order information system, field 'purchasing group', procured directly, information system, transaction co26, purchasing group, material group
Related Notes :
102628 | CO26/CO28: Field 'Procurement type' is blank |
95256 | CO26/CO28: Material group for component not filled |