Problem Description

In Metric environment when I try to connect square straight duct to square to round coupling specification error is shown. As example:
Place Seal Duct and connect  square to round coupling to it. Change Data type in Component Preferences to "From Settings" select specification for rectangular components and correct size to match square end of coupling. Try to connect straight duct to coupling - specification error will be shown.

Reason 

Catalog that is shipped with AutoPlant for Round components (Rnd_McGill.mdb) has incorrect MAIN_SIZE for  square to round coupling (AT_SQUARE_ROUND).  MAIN_SIZE of the straight duct has value without unit definition as the MAIN_SIZE of the square to round coupling has it. Example: duct's MAIN_SIZE is 200x250 square to round coupling's MAIN_SIZE is 200mmx250mm

Steps to Resolve

  Edit catalog and change AT_SQUARE_ROUND's MAIN_SIZE to values without units. Rebuild specifications.