MRP- md04

Question

Hi Experts,
Material A was below its reorder point. MRP created a purchase req-ABC and latter converted to Purchase order-123xxx. Then I can see in MD04 that the Purchase Order-123xxx has an exception message 20 (cancel process). When the MRP background job run another purchase req was created because the stock is below the reorder point.
I am wondering why it creates another purchase req-DEF, MRP should still recognize the Purchase Order 123xxx. Therefore should not generates new PR.
How exception message generates? do you think it affects the MRP run?

Answer 1

You should chek if the receipt date for your PO covers your requirements. In many cases, SAP trigger an exception message for "manually" rescheduling some Elements (such as production Order or Purchase Order). If the Order is not rescheduled, the system suugest to cancel it and generates a new element (a planned order) with the "right" supply date and the proposal to reschedule. Let say:
Initial:
Today       Stock                           100
Today       Demand                       -400
Tomorrow  PO                              500            (must be rescheduledfor today)
After MRP Run
Today       Stock                           100
Today       Demand                       -400
Tomorrow  Planned Order               500           exception --> reschedule for today
Tomorrow  PO                              500            exception --> cancel process
Regards
Dario