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Microsoft Dynamics AX (Archived)

Help - Dynamic negative days issue

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Dear experts,

We have a problem with our MRP, and I am really puzzled on how to fix it. 

We have a setup with a cross-dock and several warehouses. The default order type on CD is purchase, and on WH - transfer.

Now, we have a 20 days LT on purchase, and 5 - on transfer, which gives a total LT of 25 days.

The problem arises when we run the MRP for the WH:
Since the transfer lead time is 5, AX will look for receipts within 5 days from today (dynamic negative days). IF there is nothing to cover the demand - it will place a new order, which will arrive 25 days later  (purchase + transfer LT).  But if we have a transfer order incoming on day 7 from now, we actually do not need the suggested order, as by the time it arrives we will have too much inventory. See simple illustration below:

Illustration.JPG

Is there any way to make dynamic negative days to look at the TOTAL lead time instead?  Or any other smart ways of tackling this issue? 

I am a bit hesitant to manually specify negative days = purchase lead time for each item.

Thank you in advance!

Kind regards,

Tatjana M.

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