Friday, June 7, 2013

SSRS Error: An item with the same key has already been added

This typically means that you have an column in your dataset query that is specified twice. For instance, SQL will let you return "Order Number" twice in a query, but if you try to use that query in SSRS, it will error with "An item with the same key has already been added".

Remove the second instance of the column or alias the column to a different name to keep the error from coming back.

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