Solution : https://service.sap.com/sap/support/notes/872340 (SAP Service marketplace login required)
Key words :
system issues error message cn688, xtpext_mat-kstarn item category reason, attached correction instructions, bapi_alm_order_maintain bapi, -stock material, maintenance order, service order, purchasing data, terms cn 688, resbd-saknr
Related Notes :
| 899011 | Purchasing data at component level cannot be changed |