Raw Material Lot Received using P.O cannot be used for Material issue in Work Order transactions

Raw material is received against a P.O and the Lot status is active and the material status is active. The item on hand is showing and the item is available to transact also. However we are not able to use the item to issue against the WO. The system is allowing to issue the same material against the WO if the I do a misc. receipt of the same item in the same subinventory. The lot expiry is getting defaulted in both the cases as 01-Jan-1970. We are not able to identify from where it is getting defaulted. But still