Unable to release purchase requisition for a buy item even though BPA is valid

We are trying to release a Purchase requisition for a Buy item from a constrained supply plan. But the line gets errored out in the Supply orchestration with the error message "A value is must for the Price attribute. For master items, you must provide a price when there's no list price defined for the item in Product Information management or a different UOM other than the primary UOM of the item is provided".

We had checked the following:

1.The item has a valid BPA with a price defined.

2.The ASL is defined for that item with the respective supplier