Community Tip - Did you get called away in the middle of writing a post? Don't worry you can find your unfinished post later in the Drafts section of your profile page. X
I am getting again the same problem where in it states the units are not compatible
Because Prime is not using SUC (static unit checking) , in Prime you should always add units where they belong, even though the value is zero.
Of course your second try with VA(PT,units) must fail because PT is unitless but units=mm.