Stacked fractions for secondary units (Connect U16)

Hello, I'm trying to get my secondary units on a dimension to have stacked fractions like the primary units have. The primary units are the actual dimension & the secondary units are just keyed in values. I managed to get the primary units correct by inserting a stacked fraction in the text editor box, but when I try the same thing with the secondary units the fractions don't stack, even though they display properly in the text editor box. Is this a bug or can't you edit the secondary units anymore to read what you need?

     

Thanks,

Kevin