Inventory Txn costing and distributions are not being generated

Recently we have noticed that our inventory transactions (PO Receipt inventorization) distributions are not being generated. The distribution tab in Material Transactions window is disabled.

When we run Create Accounting - Cost Management for the month, the report says "there are no eligible transactions to account"

The Costed field in Material Transaction says No

I researched the problem and checked the three things listed below as suggested by the people. They are fine.

• The subinventory is an asset subinventory
• The items are cost enabled and inventory items.
• The cost manager in Launch interface managers is Active

Kindly suggest possible causes for the problem and the solution.