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PrasunnaPrasunna 

Trigger to fire if anyone enter already existing event id to new opportunity

Hi ,

When we are updating event id(field) in Opportunity Object, If the same Event Id is already there in Salesforce. Is there a way to trigger an error saying thet event id is already there in salesforce and also show which opportunity the Event ID appears on. How can we do this by using Apex trigger, Is there a way to do this without Code? 

Thanks,
Pavithra