Here we would like to draw your attention to OMRM 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).OMRM is a transaction code used for C MM-IV Customer-Specific Messages in SAP.
It comes under the package MR.
Transaction OMRM technical data table
|Purpose||C MM-IV Customer-Specific Messages|