Hello Kedar,
This document might be of help to your ABAPer.
User-Fields in QM and PM/CS Notifications : Screen-Exit QQMA0001
I understand you've already did this job.
Next, your sync checks can be written in User -Exit QQMA0014. You need to code here so that if both the field values do not match, the Notification while saving throws error, gives a messge pop-up. for this this document helps you (your ABAPer)
User Exit 'QQMA0014', the applications
KJogeswaraRao