Solution : https://service.sap.com/sap/support/notes/1298027 (SAP Service marketplace login required)
Key words :
query item attribute values, delivers incorrect attribute values, document attribute values, transaction /sapcnd/ueass, /sapcnd/fieldname reason, attribute values, attribute mapping, relevant attribute, /sapcnd/userexit_attributename, items created
Related Notes :
| 809820 | Userexit concept for pricing |