Auto PR Generate by MRP

Dear Experts,

I have a BOM of process material and  the component material which is use n in BOM is type raw material.

I run MRP through  MD01 and generate a planned order for that process material.

but my requirement is that if planned order  for 10 qty. [ my ration in BOM is that 1=1]

and component qty is also required 10 qty.

and in stock its only 5 qty. than its automatically generates a PR for 5 qty for that raw martial.

and first i search on SCN but i am no getting any correct solution so please help me.

Thanks

Mahendra