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Firmed and released schedule lines being modified in the firm zone

Hi All,

I am using a Firm Zone (FZ) in the Schedule Agreement of 30 days, and a Planning Time Fence of 5 days, with an MRP type P1.

Schedule Lines are firmed (marked with * in MD04) when they get into the FZ. But it often happens that the system modifies them afterwards

Is this behaviour normal?

How can I avoid that?

Thanks in advance.


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2 Answers

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    Former Member
    Nov 04, 2015 at 12:12 PM

    The firm zone is effected until only 30 days for remaining days as per trade off zone day maintained it will be remove the star from MD04.It depends from the date on which you run the MRP.

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    • Thank you for this link.

      I understood a couple of things here! It doesn't explain my problem, but it confirmed again that modifying a firm schedule line is not meant to happen in SAP. There is probably a bug or something here.

      I won't mark this thread as answered for a while, as I still hope that someone proposes an explanation to this behavior.


  • Nov 04, 2015 at 02:12 PM


    Please check "Binding on MRP" parameter in Scheduling Agreement. If you have wrong parameter here, MRP will move lines in Firm zone:

    Schedule lines after trade-off zone can be changed by MRP1Schedule lines within trade-off zone can be changed by MRP2Schedule lines can always be changed by MRP
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    • Hi,

      There seems to be no difference. In fact the trade-off zone comes right after the firm zone, and not in parallel.

      I also tried to change leave the "binding on MRP" field to blank. No difference here neither.

      The system seems to understand that these lines are firmed, but there is probably an exception that makes MRP sometimes modify a firmed line, and not in every occasion.