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When I update my edmx from database ( I added primary keys on many-to-many relation table)
I get duplicated properties like
InstantceType and InstanctType1, for each refresh from db I get a new property
any idea as to what is causing this?
It is probably that the EF model has become confused (corrupted) after the keys were added. A many-to-many table is a bit special, since it will not show up as an entity in an EF diagram if it only contains keys.
To fix this problem, the simplest solution would be to delete the model and then regenerate it.