In Request a Position Change approval rule, has anyone built the condition on Assignment Category?

Summary:

I am trying to configure an approval rule for the Request a Position Change. I want to use the Assignment Category field in the condition stating if the proposed position's assignment category is "X" and the current position's assignment category is not "X" however the approval rule is not finding the "Assignment Category" Values. Those values are tied to the EMP_CAT common lookup type. Is there a way to use this field and it find the correct values from that look up?

If I do this same condition but use the Regular/Temporary field, I get a LOV's and the approval flow works. The problem I'm having is that the Assignment Category LOV's is not populating in the approval rules work area.