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FaultException `1 An item with the same key has already been added.

Hi everyone!

I am new in customizing the dynamics CRM 2011. I am importing data through sync function.

I created a c# solution that will retrieve data from a source database, then import it in CRM through the Create method.

The problem is, I encountered the error:

"An item with the same key has already been added."


The entity where I'm supposed to create a record is still empty. That is why I'm wondering where the error came from.


Any help will be highly appreciated.

Thank you so much!