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MRP keeps pushing delivery schedules out, refusing to firm them (ME33L)

Former Member
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1,097

I hope someone has seen something like this before and can let us know where to look. MRP keeps pushing our delivery schedules out even though it is recommending that they be rescheduled in. What we'd like to happen is for MRP to leave these schedules alone so that they would move inside the time fence and be firmed automatically. Here is what is happening:

Part X, MRP type P1, firming type 1, MRP group blank. Planning time fence 05/07/2007, available quantity -20.

Three schedule lines exist for 05/07/2007, two for 10 and another for 30.

MRP will run tonight. Processing Key = NEUPL, purch req = 2, sched lines = 3, MRP list = 1, planning mode = 2, scheduling = 2

Tomorrow, the planning time fence will be at 05/08/2007 and the three schedule lines will move out to 05/08/2007. The won't move inside the planning time fence and firm up. They SHOULD BE 05/07/2006 and firmed!

We originally thought that we may have to create a release with ME84 before these would firm, but it made no difference. They still won't firm unless someone manually changes the date on each and every schedule line.

Does anyone know what we can change or run to get these schedules to firm up instead of having them pushed out continually?

Accepted Solutions (0)

Answers (3)

Answers (3)

Former Member
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Hello Randy,

Can you just change one parameter in your MRP run.

Change planning mode to 1

and then see what happens.

This could solve your problem.

Former Member
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Hi Randy,

I gone through practically for the same situation...I think your requirement is to create schedule lines within planning time fence and MRP should not reschedule out. if this is correct..then

This is not possible becuase with MRP type P1, all procuremt proposals and new requirements will be rescheudle out at first MRP run and will be placed out side the planning time fence because here MRP thinks within plannig time fence you might be having your master plan which should not be disturbed...but

Next day these scheudle lines will be taken inside (rescheudle-in) automatically once there dates lies atleast one day before of the planning time fence.

And once they will be inside these schedule lines will be firmed automatically and will not be reschedule out in the next MRP run.

With using scheduling agreeent firming zone you can fix the schedule lines but if you get the new requirements then these will added and MRP will create the procurement proposals which is diffrent from the MRP types.

if you have any question then please inform, i can give you more details.

Regards

TAJUDDIN

Former Member
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Hello Tajuddin,

Unfortunately, the delivery schedules are scheduled out at EVERY MRP run, even though they are needed in the past. MRP somehow keeps them outside the planning time fence, every day, so that they are never firmed. Could this be caused by a daily MRP run?

Regards,

Randy

Former Member
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Randy,

it should definitely work as you expect. Does the part's MRP type really has firming type = 1 (Maybe somebody changed your P1 to firming type 3?) ?

If yes then do a small test: Run MD03, then run MD03 again with 'MRP date' = today+1. Problem still persists? If yes, then we have to look closer at MRP. If not then you should check if you have other programs manipulating schedule lines.

Regards, Martin

Former Member
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Hello Randy,

Good to see your reply. I have written that this is not possible to create firmed scheudle lines within planning time fence for first MRP run...You try this i hope this will work for you...

1) Schedule MRP job around 22 to23H at night so this should finished before 24h (before the day end).

2) After MRP finishing you will get schedule lines after plannig time fence but once the day passed your schedule lines will be fixed and next morning you will firmed schedule lines within planning time fence.

3) And the when the next runs these firmed schedule lines will not be displaced again out side the planning time fence. Only new requirements will be reshedule out.

4) Like wise every night MRP will finish and next morning you will firmed schedule lines.

I hope this will help you.

Regards

TAJUDDIN

Former Member
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Hello Martin,

It took a lot more digging. The firming type is definitely one. Our system is configured so that schedule lines will not firm until after they have been transmitted to the vendor. The transmitted quantity is in EKET. For some reason I have not been able to determine, they had been using planning mode 3 when running MRP in the background. This wipes out and re-creates the unfirmed schedule lines, which wipes out any record of what had been transmitted.

When we corrected this, we took a look on Monday and didn't see any difference in MRP. Based on what we know now, the lines just outside the time fence wouldn't firm until the MRP immediately following the release/transmission, so we wouldn't see the difference until Tuesday morning.

I think the problem is solved now. It'll take a bit more time to be sure, but I'm going to mark this question as closed. Your suggestion was very helpful in testing the effects of our changes.

Thanks,

Randy

Former Member
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Hello Randy,

thanks for the update. I didnt remenber this customizing indicator when posting.

Still wondering why planning matters here. I think it should have the same result for all planning modes. Of course planning mode 3 in general should be avoided for performance reasons.

For interested observers I attach the description for this setting in MRP customizing.

Regards, Martin

-


Indicator: Only Firm Transmitted Schedule Lines

-


In this step, you can set an indicator which is used to set only those schedule lines that have been transferred to the vendor.

You can firm schedule lines within the planning time fence (in the same way as planned orders or purchase requisitions) according to the master schedule item firming logic. The planning time fence is a number of days that is calculated into the future starting from the current date. Therefore, the last date of the planning time fence changes every day.

In the firming logic, existing schedule lines are also firmed as soon as they move into the planning time fence.

Schedule lines that lie outside the planning time fence and whose quantity is adjusted in the planning run due to a change of the requirements quantity are firmed with the new quantity as soon as the schedule lines move into the planning time fence.

The schedule lines are transferred to the vendor for the amount recorded in the stock/requirements list at the time of the data transfer.

If you only want to firm the schedule lines in the planning time fence that have been checked and transferred to the vendor, you can use the indicator, Only firm transmitted schedule lines. By selecting this indicator, the system only firms the schedule lines that have been sent to the vendor.

For schedule lines whose quantity has changed and which have moved into the planning time fence, the following occurs if this indicator has been set: if the MRP controller/purchaser does not confirm the procurement plan by sending the changed quantities to the vendor, the schedule line quantities that were sent to the vendor in the previous data transfer are firmed within the planning time fence. This guarantees that the system cannot firm any quantities that have not been checked. It also means that the vondor does not receive any messages for unchecked schedule line quantities.

Activities

Define the indicator per MRP group and allocate this MRP group to the materials for which this indicator is to be valid.

Further notes

The message transfer is a purchasing function. You can find it in the purchasing menu, Outline agreement -> Scheduling agreement -> Messages -> Print/transmit.

Former Member
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Hi Randy,

I haven't messed with this a lot, however have you maintained the firm zone and 'binding on MRP' indicator in the line item of the schedule agreement? If you are looking at the line item details click on the magnifier glass (Shift + F5) for additional data.

Hope this helps,

Jerry

Former Member
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Hello Jerry,

Thanks for the help. Unfortunately, all the settings on the order look Ok. Firm zone is 28 days, no trade-off zone, and the 'binding on MRP' field is blank, so MRP isn't allowed to change anything within the firm zone.

Unfortunately, SAP will still not allow anything to get into the firm zone unless we manually put it there. There must be a way to automatically firm schedules at the end of the time fence.

Randy