Here we would like to draw your attention to MRM4 transaction code in SAP. As we know it is being used in the SAP MM-IV (Invoice Verification in MM) component which is coming under MM module (Material Management).MRM4 is a transaction code used for Number Ranges, Invoice Verification in SAP.
It comes under the package MR.
Transaction MRM4 technical data table
|Purpose||Number Ranges, Invoice Verification|