pick release process could not allocate of item for order as there was insufficient quantity available or inventory allocations have failed, and the line has been back ordered.

 Question: pick release process could not allocate of item  for order as there was insufficient quantity available or inventory allocations have failed, and the line has been back ordered.
Oracle EBS Apps R12

Answer: 

Please confirm whether the inventory period is currently accessible for the specified dates of the order. If it is not, kindly proceed to initiate the opening of the inventory period and conduct a thorough examination.

SELECT SEVERITY, STATUS, A.*

FROM WSH_EXCEPTIONS A

WHERE BATCH_ID = 6393351