How MRP will work?

[avinash_sharma]

Hi All,

Below is the description of the scenario :

Suppose X is a in-house production material. And 'A'(Externally procured material) is one of the components in the BOm for X.  Now a SO is created for the X and let the delivery date be 25/06/2012. Based on  Goods issue date  in SO which I made it to 21/06/2012 a MD04 entry is created(Just to test I made the Production time to 0 days). Now what I want to know is that on what basis the entry for 'A' will be created in MD04(i.e; procurement proposal for A). The Planned delivery time for A is 1 day. I was not able to figure this out, as there were many depreq for the same date in MD04. Can anyone tell me what will be the  requirement date and how MRP calculates it?

And, if we know the Planned order is it possible to know from which SO it has been triggered ?

Let me know if any other information is required.

Regards,

Avinash

[Former Member · Accepted solution]

Hi Avinash

Suppose X is the FG and requirement date is 21st for X.

Since it is inhouse produced materials, system will check the inhouse production days defined in MRP2 view to calculate the basic start date and Finish date. There are two things here to define the inhouse prod days. one is independent lot size prod days which is in MRP2 view.

Another one is lot size dependent in house prod days which we are entering in work scheduling view. System will calculate the in house prod days based on the lot size dependent data you have given in work scheduling view.

for example - if you have maintained the base qty is 300 and processing time is 1 day in work scheduling view and your planned order qty is 3000, den system will take in house prod days in 10 days.

the your start date of your material X would be in 12th and finish date would be on 21st.

so the dependent req to the material A would be on 12th.

since it is a procurement material , system will check the planned delivery time and GR processing time . If both includes 5 days, den your start date for material  A would be on 8th and finish date would be on 12th.

This is how MRP defines the dates.

In between suppose if your operation routing timings is more than your inhouse production days den system will adjust the basic dates based on the routing timings after converting to Production order. For this you have to do settings in OPU5 as adjust basic dates in adjust scheduling at plant level.

Hope this will clear your doubt.

Santhosh.