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Duplicate requirements in MRP

Microsoft Dynamics AX Forum

Young dumb and broke asked a question on 20 May 2019 2:02 AM
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Hi

I have run into a strange issue with MRP. after a successful run of master scheduling, the requirements profile shows twice the quantity than that is actually required. when I run the Master scheduling for the item individually the required quantity gets updated correctly. What could be the issue?

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magic1949 responded on 20 May 2019 6:48 AM
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It would be helpful to have more information e.g is this related to purchases or to production orders.

Do you use a forecast? if so then what is the reduction principle? Do you run a forecast plan?  i.e.is mrp system seeing both forecast and sales order demand on the run where the problem occurs?

What are the negative days- and  the coverage fence and the LT ? (low negative days can give this problem when order dates are changed).

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Young dumb and broke responded on 20 May 2019 4:13 PM
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Hi Sorry, i didnt provide more details earlier. This is related to the Production orders. We use demand forecast and use a monthly reduction principle. and we do run the forecast plan before running master scheduling. we have a negative days setup for 3 days the and the coverage time fence is 365 days. In general when  MRP execution completes we see duplicate requirements and as soon as we run it manually for the particular item it shows correct values.

any pointers would be of great help. we have setup negative days as  3 days so that we do not have too much time where there is no coverage.

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magic1949 responded on 14 Jun 2019 12:56 PM
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I suspect rush orders or order changes within the negative days. . 

See this thread for some useful insights https://community.dynamics.com/ax/f/33/t/41087

Try running messages and look at the Explanation tab. https://community.dynamics.com/365/financeandoperations/b/timsaxblog/archive/2016/03/17/master-planning-explosion-explanation-in-ax-2012

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magic1949 responded on 20 May 2019 6:48 AM
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Suggested Answer

It would be helpful to have more information e.g is this related to purchases or to production orders.

Do you use a forecast? if so then what is the reduction principle? Do you run a forecast plan?  i.e.is mrp system seeing both forecast and sales order demand on the run where the problem occurs?

What are the negative days- and  the coverage fence and the LT ? (low negative days can give this problem when order dates are changed).

Reply
magic1949 responded on 14 Jun 2019 12:56 PM
My Badges
Suggested Answer

I suspect rush orders or order changes within the negative days. . 

See this thread for some useful insights https://community.dynamics.com/ax/f/33/t/41087

Try running messages and look at the Explanation tab. https://community.dynamics.com/365/financeandoperations/b/timsaxblog/archive/2016/03/17/master-planning-explosion-explanation-in-ax-2012

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