I have an expression such as: =sum( IIF( Fields!QuantityType.Value="LB", Fields!TotalQuantity.Value ,0) ,"Grp_Number" ) ....Grp_Number is the grouping where I'm trying to insert this summation / total. Under Grp_Number, I have a 2nd grouping by QuantityType, where there's two possible values, LB or NLB. So, a Grp_Number could have possible 2nd groupings of: 1. only LB 2. only NLB 3. both The only problem is when there's no LB, then the expression comes back as #Error. Any suggestions are welcome! Thanks!