Question : Conditional Format IF Expression

I've tried applying the following conditional format on a form:

IIf([ActDec]=0,Null,([ProjDec]-[ActDec]))

The result I'm trying to acoomplish is that if ActDec has a zero value to display either nothing or 0, otherwise display the result of the function of ProjDec-ActDec

Answer : Conditional Format IF Expression

This seems to work for me.
(Sample DB attached)

Test this and note what the difference is between your db and mine.

Keeping in mind what Leigh posted above, in case it is applicable here...

JeffCoachman

Database33.mdb (220 KB) (File Type Details) 

sample