1 Reply Latest reply: Jul 18, 2008 4:41 PM by Donal O'Leary RSS

MRP - firming Purchase Order dates for MRP run

Donal O'Leary
Currently Being Moderated

We are using demand management and MRP to create purchase requisitions for external procurement. It works fine and creates purchase requisitions based on the monthly demand entered in MD61. However, if I have a purchase order with a delivery date of a few months in the future, MRP always asks me to reschedule the order to meet current demand. i.e. it reduces the quantity on a requisition because it expects the rescheduled PO to meet the demand. In addition, it creates a requisition for the full demand a few months out, even though I have a PO delivery on that date (as it expects me to move the PO to the current date) See example below


Does anyone how to get MRP to treat a PO delivery date as fixed or firmed and create requisitions based on this?

We are using MRP type PD,  a planning strategy that looks only at LSF in demand management and KSL in SD requirements.







Current Stock:               500 KG

Safety Stock Level:        1000 KG



Aug: 1500

Sep: 2000

Oct: 3000


PO del date 01.10.08 : 750 KG


When I run MRP it proposes the following


01.08.08 Requisition: 1250 KG. Aug demand (1500) + deficit below safety stock (500) = 2000 less PO that it is saying I should move to July (750). (I want this qty to be 2000)

01.09.08 Requisition: 2000 KG. Sep demand (2000) - OK

01.10.08 Requisition: 3000 KG. Oct demand (3000). Doesnu2019t look at PO dated 01.10 at all. (I want this qty to be 2,250)