Encumbrance & Actual for material inventory

[hiszaki]

Dear All

We are in R12 & have an inventory item (material Item) & need to control all purchasing from this item. We use summary budgetary control. The problem is that the encumbrance account doesn?t change to the actual account after matching the PO receive with the AP invoice.

Need help to control the material account & to change the encumbrance to the actual.

Thanks
Hisham