Save a relation with between two entities an N-N association

Question

I\'ve a Entity Framework 4.0, with poco object. the edmx model file is generated from the database.

This datacontext is accessed through WCF service, it\'s only mean

Answer 1

Just a thought... how are the keys setup in the Right_Group table? If you use both IDRight and IDGroup together as primary key - this problem might occur. One suggetion is to add a new column (ID) into the Right_Group table, and having this ID as the primary key. Then use foreign keys on the other columns (IDRight, IDGroup) respectivly.