An item with the same key has already been added (SQL Report Services)

Screen Shot 2014-02-26 at 7.42.34 AM

 

I was creating a new report in SQL Reporting Services, I pasted in the SQL query for the report and up popped the message “An item with the same key has already been added”.

Turns out I had two columns with the same name – which as always with these error messages, begs the question, why not just say so!

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