Error: the material sourcing process failed to create picking suggestions for line ---- of move orde

 In Back to Back sales order After the full flow it is working properly but after the Pick release the sales order during the Move order transaction the Transact Tab in not Enable also, when i click on the allocate tab the error disply "Error: the material sourcing process failed to create picking suggestions for line ---- of move order number ------" 

and also All the items are back ordering..