Thanks on that.
That's available in helper namespace I see.
I tried to use an Interface with 2 of your entityclasses that are almost identical except for some fields missing from one table.
One's history and the other is current test samples.
I wanted the same hlbl = highest level business layer
methods to handle the 2 cases.
I'm pretty sure I defined the Interface properly as I got no compile time errors.
On runtime it basically says that the entity I'm passing in is not one of those Interface things.
I solved the problem by just putting object instead of IRequestEntity in method signature, but wonder if you can tell me why this would not work.
TIA
Terry