Hi Kedar,
Please refer OSS note 1053858 - Setting relevance of stocks to MRP via CIF (customizing)
and 487166 - Relevance of stocks to MRP
In APO, you cannot use the Customizing function to set which stock types are MRP-relevant.
As of SCM 4.0, you can determine the availability of stocks in the product master (transaction /SAPAPO/MAT1), on the requirements tab page. The settings possible here are not sufficient for mapping your business process.
You can change the stock type internally in a user exit APOCF011 so that the stock has the behavior you want.
Regards,
R.Brahmankar