Budget consumption for Open PO

Hi,

I have done the configuration that that at the time of Cost Centre PO creation, no fund management document will be created and at the time of Invoicing it should be created, this is OK but i am facing the issue in this case.

PO       - 10,000

GRN     - 1000

Invoice  - 1000

Now the FM document created

PO -      + 10000

             - 1000

GRN - No document

Invoice   + 1000

So ultimately my Budget consumption is 10,000 but i need it should be only 1000.

Please help guys.

Regards

Ajay Goel