Solution : https://service.sap.com/sap/support/notes/1257803 (SAP Service marketplace login required)
Key words :
attached correction instructions, terms backorder processing, backorder processing, transaction co06, sales order, transaction va02, material/plant, system issues, error message, 'sales document &1
Related Notes :
| 1126733 | co06: item can be changed while being updated in parallel |