A manufacting part may contain unrecognised and undeletable expressions.
Solution
These expressions may have been create by point definitions in manufacturing
operations - for example a 'Point on Face' definitions will create 2
expressions refering to the U & V locations on a face. As the operation is
dependent on the expressions, they may not be removed. If the related
operation is deleted, then a 'File - Utilities - Part Cleanup' may be used to
remove the expressions.
Notes