Diff F.13-F.19 and MMPV-MMPI

Hai Can any one tell me diff.. between F.13 and F.19 and MMPV and MMPI
i know that F.13and F.19 used to clear GR /IR account but in which
situation we will use this t-codes
In the same way we use to close/open posting periods in MM we use MMPV
or MMPI but in which situation we use this t-code
And what is parameters for executing F.31
Thanks and Regards
Surendra babu.

I'm not an MM person (FI) - but it's my understanding....
MMPV/MMPI are used at month end to open and/or initialize the material master posting periods (so that GR and IR can be posted) in these periods.
F.13 We automated weekly for GRIR clearing by assignment field (PO #). This clears the GR against the IR if both exist.
F.19 An interesting T-code - I'm not totally clear on this t-code, but it appears to be something like an accural at month end and the reversal of this the 1st day of the next month for "Invoiced but not yet delivered" or "Delivered but not yet invoiced". If you run this (which I don't think many companies actually run), select the OPEN ITEM only on the selections tab. Otherwise, you'll see all (even postings that can't occur due to them being cleared already by F.13).

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Diff F.13-F.19 and MMPV-MMPI

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