3478017 - Error "Changing Project Task not possible; field is read-only" While Migrating Open Sales Order

While migrating open sales orders below errors are displayed. 

• Changing Project Task not possible; field is read-only
• Changing UUID not possible; field is read-only
• Changing Project Task ID not possible; field is read-only
• Project task missing
• Project missing

SAP Business ByDesign 

1. Go to Business Configuration - Overview
2. Migration of Open Sales Orders
3. Migrate open sales orders using the migration tool
4. Execute the migration file

System shows Below error:

• Changing Project Task not possible; field is read-only
• Changing UUID not possible; field is read-only
• Changing Project Task ID not possible; field is read-only
• Project task missing
• Project missing

Under Items Project Task (Cost and Revenue Assignment) is maintained. 

Project Task (Cost and Revenue Assignment) is used for multi customer project or a direct cost project, but the project task assigned is "Service - time and material (project)" (For instance). Those are meant for customer projects with sales integration only. 

Remove the values in Project Task (Cost and Revenue Assignment) and migrate the sales order list.

error; migrate open sales orders; Changing Project Task not possible; field is read-only; Project task missing. , KBA , AP-SLO-SO , Sales Order , Problem