How to update average cost for inventory item in miscellaneous Receipt

Hi
I have to make miscellaneous Receipt for item at that time i need to put average cost for receipt quantity .I am using mtl_transactions_interface table to insert record and
INV_TXN_MANAGER_PUB.process_transactions API to process record .
I am populating avg cost in transaction_cost column .It is coming in MTL_Material_transactions table .
But it is not updating item average cost it is showing 0 avg cost .I have launch cost Manager program also
How can I update average cost at the time of miscellaneous receipt.

Thanks
Jitender