Budgets - Encumbrance Not Getting Converted To Actuals For Purchase Orders (Inventory Purchase Order

Encumbrance Not Getting Converted To Actuals For Purchase Orders (Inventory Purchase Orders) (R12.1.1 Vesion)

Encumbrance does not get converted to Actuals for Purchase Orders when the Receipt is created and delivered.

Budgets are loaded at Sub Inventory Budget account level.

Please let me know any one have any solution or workaround for Budgets for  Inventory Item purchases in Release 12.