Hi Uday,
This is obviously a bug. I had validation bugs in 10.1.1 for a different item. I would suggest upgrading to 10.3.0 to see if it still occurs. If you are on 9.x, upgrade to the highest 9 version (or an MTS, LTS, depending on the release strategy) . If it still occurs, lease send the details, including your Mendix Studio Pro version to support@mendix.com.
Go Make It