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Detect Duplicate

Hey Guys,

 

Is there any way to detect a duplicate in the Child Object before a record Item is actually saved?

 

Sample Object:

 

HotelName     Lookup field

AirportName   Lookup field

AirportDistance   text

AirportDirection   PickVal

 

I would like the system to check if the record already exists and prompt the user to select again.

 

Thanks


Manny