Finding Out Why an Item Is Locked Against Deletion

You can find out why items have not been deleted by clicking on the relevant [?] button in the "Why" column.

For example the PART definition above was not deleted, and the "Why" button produces this panel which shows that it is referenced by:

• Two *SET_PART definitions. (These would not in themselves lock the part if Remove from Sets is active)
  
  
• Two connections. It is these which are truly locking the part.