Hello,
MRP based on valuation type is not possible in standard SAP.
During conversion PReq -> purchase order, an account determination is performed with the corresponding valuation type automatically.
If purchase requisitions for materials subject to split valuation are generated within materials planning (Transactions MD01, MD02, MD03), the system does not supply a default value for the valuation type. The header record is generally used (without valuation type). This is standard.
Refer KBA 1854009 - Purchase Requisition created by MRP with valuation price 0
What is the business requirement? Why do you want to plan on the basis of valuation type ?
Best Regards,
R.Brahmankar