You seem to have spelled this out yourself:
IsEmpty ( LATC Registrations::Payment date) OR Isempty (LATC Registrations::partner agency) OR IsEmpty (LATC Registrations::Has Credit)
That would seem to meet the stated requirement that you want a color change if any one of these three fields is empty.
Simpler is taking advantage of Count() working if field is empty as:
Count ( field1 ; field2 ; field3 )Any number returned means at least one of the fields has at least one character.
LOL... Actually I wouldn't have used IsEmpty() on that date anyway but rather: not PaymentDate :-)
Thanks everyone for the help. However, I ran into a couple of problems, which could simply be my lack of scripting abilites:
The first suggestions of simply putting the OR inbetween the 3 different "isEmpty" criteria actually applied the conditional formatting to all entries in the layout. So I'm not sure if I should have added another operator in there somwhere.
The COUNT function seems to work perfectly!!
THank you for your help!!!!