Sales Order is being currently processed by the user
My Business Scenario:
1. Sales Order will be created.
2. Delivery will be created based on that sales order
3. In case of any complaint from customer, service notification will be created.
4. Based on service notification, return order for that material will be created with reference to sales order.
5. While creating the return order, I am facing the error "Sales document xxxxx is currently being processed (by user xxxxxxx)"
This happens while upgrading from SAP 4.7 to ECC 6.0.
Kindly provide me the solution.