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CNMM transaction is overwriting PR Material and Qty which was converted to PO


Case is,

1. PR created with Material M1 & Qty 3 PC at item 10 level.

2. PO was created with above PR reference further GR and Invoice is also processed.

Issues is,

1. We observed that same PR item Material is changed to M2 with Qty 4 Pcs while it was completely processed.

When we checked Item changes then observed that PR item 10 changes are carried out with transaction CNMM.

How this is possible?

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2 Answers

  • Apr 10, 2018 at 09:10 AM

    I have never seen nor used the CNMM transaction, so I have no idea at all what can be done with this transaction and I am also not reading OSS notes for transactions which we do not have in use, so I can't tell you if there was an error like that which might have been fixed in the meantime.

    From the change history I would just say the user WUEV changed the requisition completely.

    What would be needed to be analyzed is whether it is really true that the PO already existed at this time 11.10.2017 13:10:27 and if the PO had a reference to the PR at that time.

    Since the PO itself has no creation time you might need to look at the creation time of the output message to have an estimate about the PO creation (pre-condition: the messages are determined and send immediately when the PO is created). Or maybe the PO was changed prior to the PR change, this could also be an evidence that it existed.

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  • Apr 09, 2018 at 02:21 PM

    If you can reproduce the issue then I would recommend to take it to SAP.

    I think there are not many here who know how procurement within a project works, CNMM is not a MM transaction, it is only located in PS.

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    • Hi Jurgen,

      We tried to replicate the issue but system is adding new line item in PR (Which is what expected and correct).

      But now End Users are asking for the explanations that how system allowed existing PR item to be overwritten with new Material & Qty after PO processing? There are many such PR's which were overwritten with new Material & Qty even when PO, GR and Invoice is posted.

      Few screenshots for your reference.

      1) PR Screen after Change.

      2) PR Changes

      So, what may be the reason?


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