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Editorial Team
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Asked: 2026-06-15T22:50:41+00:00

I have 3 entity ( Projects / Products / Negotiations ). Negotiations entity have

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I have 3 entity (Projects / Products / Negotiations).

Negotiations entity have a column named ReferencedId and TypeId which ReferencedId is foreign key for both Projects and Products table.
TypeId has define ReferencedId is belong to which entity.

But when I call context.SaveChanges(); to insert new message in Negotiation entity, this error has been thrown:

Server Error in '/' Application.
The INSERT statement conflicted with the FOREIGN KEY constraint "FK_ProjectNegotiation". The conflict occurred in database "MyMVCApp", table "dbo.Projects", column 'Id'.
The statement has been terminated.

EDIT :
This is my model:

My Model

What can I do to use 1 column as foreign key for Negotiations entity and avoid of use 2 column for this.

Thanks.

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1 Answer

  1. Editorial Team

    As you say – this is a conceptual problem.. you are misusing a Foreing Key. Don’t do this!

    Make Negotiations abstract, create ProductNegotiations and ProjectNegotiations as subclasses of Negotiations and define your navigation propterties there

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