=iif(Sum(Fields!ClsRead.Value)-Sum(Fields!OpnRead.Value)=0,"NO HSD Supplied",sum(Fields!HSDIssued.Value)/(Sum(Fields!ClsRead.Value)-Sum(Fields!OpnRead.Value)))
Answers:
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Method 1
Using IIf you have to remember that both side (TruePart and FalsePart) are always evaluated so dividing by 0 raise an #Error.
You can use custom code (right click design surface outside report > Report Properties > Code) and replace IIf with an If/Then/Else.
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