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I have two tables in SQL Server 2012. One table has a foreign key (ReportCategoryID) to another table. The Entity Developer model designer created the two entities shown in the image. Retrieving data for TtbSRReport works fine in the designer. When I retrieve data for the other table, I get the error message shown. I am using the latest 5.7 version with EF 6.

Any idea why this error happens?

"The property 'TtbSRReports' on type 'TtbSRReportCategory_4E05BDD77956EA2ABCB005B78E513AE812A61232FEC44A80858D91FDE7305FD3' cannot be set because the collection is already set to an EntityCollection."

We cannot reproduce the issue at the moment. Please send us the following:
a) the DDL script of your TtbSRReport / TtbSRReportCategory tables
b) a test model (*.edml, *.edps)

I turned off ProxyCreationEnabled and it worked.

The bug you have encountered is fixed in the new (5.7.530) build of Entity Developer.