Had the original backwards. I've attempted this: =[Commitments]/((iif([FY S&S].[Report]![S&S#Commitments] isnull,[TotalCommitments],[FY S&S].[Report]![S&S#Commitments]))+[TotalCommitments])
When [FY S&S].[Report]![S&S#Commitments] is zero, I get the #Type! error. When it is not zero, this report works properly.
Appreciate the feedback on naming. I am self taught and just making it work. What is meant by the comment to 'cater to VBA'?