The generated EntityCollections don't include a user code region for interfaces in the class declaration. I tried just copying the code region (__LLBLGENPRO_USER_CODE_REGION_START AdditionalInterfaces) from another class, but upon regeneration it removed it anyway.
So I guess it doesn't just do a blanket search for any of the defined code regions, they actually have to be legal in that class's context. This is a bit of a bummer. Is there a need to restrict adding additional interfaces for EntityCollections? If not, is there any chance we can get this added?
Thanks.