@Ankur Bawiskar : The solution given in Solved: MRVS detect when a row is removed or deleted - ServiceNow Community works for me on portal view that is before submitting the record. However I have to implement the same once the record is created. We have the submitted form available on record which can be modified and hence require the same functionality over there as well.

The approach which I followed in service portal is 
1. Detect change in MRVS through widget and update a boolean variable

2. On change client script on that boolean variable will do the further action.

Any recommandations to implement the same in UI 16?