E1: 34: MRP (R3483) Planning for Defer and Cancel for Order Policy Code '4 - Periods of Supply' Item Results in Shortage (Doc ID 2693613.1)

Last updated on JULY 23, 2020

Applies to:

Symptoms

When a period of supply item supply order, at an order maximum quantity, is deferred to a future date bucket, but is short of requirements, there is a shortfall in that date bucket.  

Steps:  
1.  Create fresh planning data for a Order Policy Code 4, Period of Supply(POS) item, with an order maximum value below expected requirements.  
2.  Enter sales orders for at least 2 different future dates, in excess (2x) of supply order maximum order quantity.  
3.  Enter multiple supply orders (3x) each for a past due date and for at least 2 different future dates from the sales demand dates entered previously, so as to generate D defer or E expedite messages of one or more of the multiples, in combination with another action message, such as a PLO (short), or a cancel (excess), or a G increase (order not yet at max).  Given that L decrease is inhibited for OPC4 POS items, by design.    
4.  Run MRP R3483 and review messages.  Note that the defer + PLO scenario does a defer, but no PLO as expected, causing a shortage.  Instead, one or more of the required multiple orders gets a cancel. This is incorrect. 
5. Review the future date2 orders, and the shortage is not corrected. 

Cause