Solution : https://service.sap.com/sap/support/notes/983013 (SAP Service marketplace login required)
Key words :
private gref_protocol_payload instance attribute, attribute typing method, typegref_protocol_payload type ref, extended xml, schema validation, changing service, incompatible change, correction instructions, prerequisites, release 501
Related Notes :
| 993562 | Duet 1.0 SP02: Release Information Note |