Savechange dataservice get nothing

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OData

WCFServices

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I have posted a question about Entity framework 6+ and WCF Data Service

Consuming WCF Data Service EF , Failed to SaveChange()

please someone tell me what I am wrong about them.

Any help would be truly appreciated,

Thanks in advance.

What I have tried:

I have tried to create a simple WCF DataService with EntityFramework 6+ and consume it another project but when I am running the app I will faced with some problems, Especially calli SaveChanges() of DbContext.