Symptom: When creating a local assembly or a local part, it is not possible to select some parts from the assembly document.

Probable cause: The parts are not included in the detailed representation of the assembly document.

Solution: Include the parts in the detailed representation of the assembly document by either dragging them from the Parts folder (in the Entities tree) to the detailed representation of the Representations folder, or by editing the detailed representation and selecting the parts in the graphics area.