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MD04 -stock requirement

I want to understand the logic for MD04.

I was under the impression that the logic was to always do pull in on existing PO’s and then to create new purchase requistions, but in the example. The PO has no messages for pull in and the system is creating new purchase requisitions.

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2 Answers

  • Posted on Oct 01, 2019 at 09:44 AM


    Your PO on 12/05 does not satisfy the requirement 12/09 for 3 quantity as available quantity is zero.

    So system created new PR on 12/09 to satisfy the dependent requirement on 12/09 for 3 PC.

    Schedule line is 2030 which is too late to meet the requirement of 12/09 so system will not consider it as it would be out side the rescheduling horizon too.

    So there is an exception message 20 Cancel process as system won't delete firmed elements during MRP run like PO or production orders. Planned has to take a action to delete such schedule line or change the delivery date to meet requirement on time. MRP working fine in your scenario.

    Best Regards,


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  • Posted on Oct 17, 2019 at 01:50 PM


    This process is called the rescheduling check and you can take a look on the following WIKI, which explains it better:


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