I Installed LLBLGen Pro version 3.1 (February 7th, 2011).
Unfortunately nothing changed: - Enum (of type byte) is defined in an dll - dll is referenced in an *. typeimports file located in a folder - folder is declared in project settings as an Additional TypeConverter folder - The enum type is loaded and I am able to define a type shortcut (in the Type Shortcut Editor) - When I try to map a field (of type byte or any other type) to an enum the shortcut is not available.

Please see the screenshots attached.

EDIT: Type Shortcut is not available to any type.

LLBLGen runs on dot.net 4.0.

You should specify the enum type as the FIELD type, not as a type converter (so on the fields tab, not on the mappings tab). Could you try that please?

Thank you very much, that worked out!