I noticed this issue in the forums here but the solution was to edit values directly in the database. Surely that cannot be the accepted fix for this issue so I'm posting an inquiry here.
I have added a scale and would like to use it in a competency framework but Moodle will not allow me to configure the scale. (see attached screenshot) I've tried every combination I can think of but always get the same error.
In fact, I noticed that the default "Separated and Connected ways of knowing" scale cannot be configured either. Notice the same error in the second screenshot where I have selected that scale and tried to configure it as well.
I must be missing something...