Making a Single Select Pick List Required

Summary

Workaround to make a single select pick list required

Content

Hello,

Currently, a Single Select Pick List (SSPL) cannot be made required.  We have a SSPL that needs to be filled in before a quote can be finished.  I have not figured out a way to error out a blank SSPL.  I tried creating a calculated attribute that is false when a SSPL is blank, and is true when it isn't blank.  Then I tried erroring out this calculated attribute when its false.  When I hid the attribute it comes up with a hidden error which works in not letting the user complete the quote, but does not look friendly.  If I keep