How to set the PASI term on a class that has the field disabled

Go to setup, class info, classes and into the EDIT screen for the class -- ELA1105 as an example  

Clicked on the CHANGE button beside the "course".  Changed the course to something else (ELA1205) - now I am able to choose the PASI Term.

Set the PASI Term to Semester 1 (or whatever term you need)


Then I changed the course back to what it originally was - (ELA1105)

The PASI Semester 1 term stays populated.

Then hit "Save" and the PASI term is now set.