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MRP-run and PR release date

Hello,

Got a question that hopefully someone can help me with:

In the plant parameters, I've set the Purchasing processing time to 4 working days.

Now, on day 0 (in the evening), I run a MRP run for a product which is low on stock; as a result, a PR is created.

On day 1 I don't convert the PR into a PO; shouldn't be a problem because I have 4 days. Next, on day 1 in the evening, the MRP-run is started again.

Now, I see that the release date in the PR is switched to the date of the last MRP-run. As a result, the availability date of the product itself is also moved one day into the future.

I don't understand this... to my knowledge, the MRP-run shouldn't change the release date of the PR, and it shouldn't change the availibility date.

I already noticed that this does not occur if I set my PR to fixed, but I'm struggling to find the logic for this behaviour...

Any suggestions?

Regards,

Oliver

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2 Answers

  • Best Answer
    Posted on Nov 16, 2012 at 09:12 PM

    If your PR is not firmed, then it is as good as non-existing when the next MRP run is executed.

    the second MRP run calculates identical to the first MRP run. Taking the replenishment lead time into consideration. And since it is a day later, the delivery date is as well shifted one day into the future.

    if your PRs are firmed, then MRP run will not touch those PRs, it has to assume that you really can get the material on time even purchasing took a rest on the first day.

    So in short: the firming indicator makes MRP believe your purchasing processing time.

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  • Posted on Nov 16, 2012 at 10:56 AM

    Hi Oliver,

    Kindly check again settings where you have assigned Purchasing processing time to 4 days. That is default processing time. have you checked site parameter section in which one check box i.e. Scheduling Info Record/Agreement. If this tick mark is done then system Scheduling according to purchasing info record or agreement.

    Check again settings from starting and do the Site reschedule.

    Regards,

    Sanjeet Kumar

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    • HI,

      Run Transaction OPPQ>click in maintain tab and check as per below instruction.

      Floats

      Floats are buffers in the total lead time, that are provided in production/process order or in the planned orders created manually or during an MRP run. The schedule margin key is used in the Material Master MRP 2 View. It is used in MRP as well as in production order.

      The floats are defined using the scheduling margin key.

      Opening period: Number of working days between the date that the order is created and the planned start date. This time is available for the MRP controller to convert a planned order into a purchase requisition or a production order.

      Float after production: Number of working days between the scheduled finish date and the order finish date; used as a float in production scheduling.

      Float before production: Number of working days between the order start date and the scheduled start date; used as a float in production.

      Scheduling release period: Number of workdays between the planned start date and the date for releasing the order. If the order release indicator is set, the production order is released by a background program that takes all dates into account.

      Plant

      Plant Name

      Margin Key

      Opening Period (In Days)

      Fl. Before Production (In Days)

      Fl. After Production (In Days)

      Release Period (In Days)

      0001

      0001

      001

      5

      2

      2

      5

      0001

      0001

      002

      5

      3

      3

      5

      0001

      0001

      002

      5

      4

      4

      5

      Regards

      Sanjeet Kumar

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