Process Rejection

Dear All,

We have planned rejection (by-product) because of process nature and unplanned rejection (scrap) because of error in process. Planned rejection can be handled by quantity with negative sign. And in confirmation screen if we enter rejection quantity then system will consume component even for rejection quantity. But there is no receipt of rejected quantity in system while in actual we have rejected material in scrap stock. So, how to map that rejected stock in SAP?

Thanks and regards,

Devang