purchase request or purchase order for internal order

Dear Friends,

I'm Facing one issue which is raised by our client in PR or PO Creation for internal order. At the time of Creation PR or PO for internal order we could not know

budget of the internal order and the usage of this budget, so we need to display the budget value and usage of the budget during the PR of Po creation based on internal order.

Please help on this .

Thanks in Advance

Ganeshkumar