Hide object when
Trying to understand how FM evaluates calculations for hiding an object.
I want to have a calculation which has 3 elements any one of which may be true and thus hide the field.
(Trip_Expense::Category ≠ "Motel/Hotel") or (not IsEmpty ( Self )) or (Trip_Expense::Category ≠ "RV Park Fees")
If I enter as above it does not work, if I use just one expression it will work.
Can someone point out my error or point me in the right direction?