MRP run externally procured items.

Dear Gurus,

I have a requirement where i am maintaining stock of a particular material which contains a number of components. This material is externally procured(F). The components of the material are also being issued individually from stock..(the material is a packet of oil seals of different sizes). My requirement is that when the components are issued, in the next mrp run the system generates pr's for the missing components in the pack. But procurement is done at header level.

Kindly help me out with the issue.

Thanks,

Anand.