"Attempted to divide by zero" When trying to compute percentage with formula

The formula below would work but I receive a runtime error "cannot divide by zero" because it looks like even if the condition is evaluated as true it still evaluates both parts before it decides which value to return. I've read articles that say there is a workaround but I don't know how to adapt it exactly. It says you can use nested iif statements. Can someone tell me how I can adapt my formula to this
Example that should circumvent the divide by 0 issue
=IIf(Fields!SomeField.Value = 0, 0, Fields!SomeOtherField.Value / IIf(Fields!SomeField.Value = 0, 1, Fields!SomeField.Value))

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My formula:
=iif(Fields!optiontype.Value = "BSE",(Fields!basemodelprice.Value - SUM(Fields!BudgetByProduct.Value)) / Fields!basemodelprice.Value, (Fields!amount.Value - SUM(Fields!BudgetByProduct.Value)) / Fields!amount.Value)

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J CAsked:
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Phillip BurtonDirector, Practice Manager and Computing ConsultantCommented:
=iif(Fields!optiontype.Value = "BSE",(Fields!basemodelprice.Value - SUM(Fields!BudgetByProduct.Value)) / iif(Fields!basemodelprice.Value=0,1,Fields!basemodelprice.Value), (Fields!amount.Value - SUM(Fields!BudgetByProduct.Value)) / iif(Fields!amount.Value=0,1,Fields!amount.Value))

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Vitor MontalvãoMSSQL Senior EngineerCommented:
jleecole, do you still have this issue?
J CAuthor Commented:
Thank You
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