Hi Rajen,
Please see this link and understand how tab merging works:
https://wiki.scn.sap.com/wiki/display/Img/TabMerging+and+blocking+input+validation
Meanwhile, seems your issue sounds like missing screen overwrite entry. See this link:
Screen and Control ID Overwrite Concept in Personas 3.0 - SAP Imagineering - SCN Wiki
Sushant