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srikanth Gottimukkalasrikanth Gottimukkala 

pop up error message(the picklist value is already selected)

how to show pop up error message(the picklist value  is already selected) when the same value is  selected in picklist field in page block table
NagaNaga (Salesforce Developers) 
Hi Srikanth,

Please check the below code

User-added image
Best Regards
Naga Kiran