Logistics Invoice verification MM - tolerances for lower limits and Credits

Question

Hello,
My end-user is wondering why the system does not re-act/block on the lower limits of the price tolerance.
I have checked several SAP document and found:
1. Blocking Invoices
If a tolerance limit is exceeded, you receive a system message. You can post the invoice in the
system, but it is automatically blocked for payment if an upper tolerance limit is exceeded.
So for the lower tolerance limit there is no block only a warning.
2. Posting Credit Memos
The system does not check if your entries in the columns Amount and Quantity correspond to
the purchase order price or the invoice price.
So there is never a message or block for Credit Memos.
3. Subsequent Debits/Credits
If you want the system to carry out a price check for a subsequent debit, it compares the
value invoiced to date plus the value of the subsequent debit with the expected value based
on the purchase order. The system takes tolerance limits into account when carrying out the
price check. If a price variance exceeds one of the upper tolerance limits, the subsequent
debit is blocked for payment.
So only a check for subsequent Debit , not for Credit.
The examples my end-user has are the following.
1. Blocking Invoices
If the Invoice price is too low, the purchaser should be informed, he has to check what is wrong in the purchase order.
Maybe the price unit was filled in incorrectly or ...
Example:
a. Standard price is 100 Eur per 1 PC
b. Purchase price is 1000 Eur per 1 PC
Purchaser has made mistake it should have been 100 per 1 PC.
I checked and the Purchaser gets an info msg 06207 Effective price is 102.00 EUR, material price is 100.00 EUR,
but he can ignore this message.
c. Invoice price is 500 Eur per 1 PC
This invoice price is actually too high compared with the standard price but because of the high Purchase price no blocking occurs.
In this case we would like the system to also block the Invoice for payment.
2. Posting Credit Memos
Purchase order has a price of 1765 Eur.
We received goods and an Invoice for 1765 Eur.
We have returned the goods to the Vendor and we post a Credit Memo of 1048 Eur.
We receive no warning and the Credit Memo is not blocked for payment
The system should warn us that the Credit Memo has a too low value and we would prefer that the system blocks the Invoice.
3. Subsequent Debits/Credits
The Subsequent Credit can be seen as an Invoice price too low and therefore we would like it to be handled the same, see 1.
Can you please give us your opinion.
Is there a possibility to change the standard behavior of the system ?

Answer 1

Hello,
The limit check values have already been set up for key tolerance PP -upper and lower limit in OMR6 tcode.
Unfortunately when we are creating an invoice with a lower value than the expected value on the PO, it doesn't trigger the invoice block.
From what I've read on the forum SAP proposed as a solution the use of enhancement MM08R002-User exit for tolerance checks=> fm  EXIT_SAPLKONT_002- Customer Exit: Change Tolerance Check, but in our system the check for upper limit is performed inside the fm MRM_AMOUNT_CHECK=>
fm MRM_TOLERANCE_CHECK
Überschreitung der Toleranzgrenze -
  IF I_AKT_WERT > I_VERGLEICHSWERT.
... Betrag -
    IF T169G-XW2JA NE SPACE.
      DIFF_P = I_AKT_WERT - I_VERGLEICHSWERT.
      IF DIFF_P > WERT2.
        E_BETRAG = WERT2.
        E_RETURNCODE = 1.
        E_SPERRGRUND = 'X'.
      ENDIF.
    ENDIF.
Could you please advise me how you have implemented the check on lower limit tolerance?(eventually a sample of coding)
Thanks,
Andrei J.