Entity framework - “Problem in mapping fragments”-error. Help me understand the explanations of this error

Question

Error 3007: Problem in Mapping Fragments starting at lines 186, 205: Non-Primary-Key column(s) [WheelID] are being mapped

Answer 1

I had this problem for quite a different reason, and the message was slightly different; it didn't say "data inconsistency is possible because the corresponding conceptual side properties can be independently modified."

I have a table involved in my model with a binary column where I store image data. I only want this data returned when I need it (performance is a feature), so I split the table using a method similar to this. Later on, I added a property to that table, then updated the model from the database. The wizard added the property to both entity types that refer to the table with the added property. I had to delete it from one of them to solve the error.

Answer 2

I had set foreign keys up in the database but framework still wasn't pulling them in correctly. So I tried to add the association myself. 

However, when I did this I would get a mapping error. It took me A WHILE but I figured out. What I did was set up the association using the entity toolbox association tool and then you have to double click on the association (1 to many) line and set the primary and foreign key there. Hopefully, this to help others who might have the same problem. I couldn't find the answer anywhere.

Answer 3

I had a table already mapped in EF. I added two more tables which had foreign keys in the previously added table. I then got the 3007 error.

To fix the error I deleted all three tables from the EDMX file, and then re-added them all at once together (via "Update Model from Database..."), instead of in stages.

Answer 4

Try to remove foreign property column from Entity set using entity model design it will solve your problem

For example

We have two tables one is customer and other one is order, using entity model design we added association between customers and orders when we do this Ado.net entity framework i will add navigation properties to both below tables.

Like Customer.Orders - Here order is list Order.Customer

One - Many relation.

So we need to remove property from with name CustomerId[Foreign key column] from Order entity set.

For reference:

http://social.msdn.microsoft.com/forums/en-US/adodotnetentityframework/thread/2823634f-9dd1-4547-93b5-17bb8a882ac2/

Answer 5

I checked my Error List window and noticed I had errors in the model. Fixed them and all is well

Answer 6

I was able to overcome this problem by the following steps: right click the designer window Select 'update model from database' Select Add AND make sure that the 'Include foreign key columns in the model' checkbox is selected. click on Finish...