Hi Prudhvi,
Scrape % is maintained in MM mrp1 tab and same is cifed to APO, also did the changes mentioned by you in costing lot size. still same result planned order quantity is not considering assembly scrap %. Here one thing we found out that if we change Procurement type of finished good from "E" to "F" external procurement then planning run is creating purchase requisition. This purchase requisition qty. is considering assembly scrap %. But we want it to be considered in Planned order(In house production).
AKS