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 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...