Hi
I think you want something like this
= IIf (([pack] > 1),(iif([CasePirce]=[BottlePrice]),[CasePrice],"") ,"")
in the record source of the list_case field, or if you want to put it in code use this:
If ([pack] > 1) and ([CasePrice] = [BottlePrice], then
[LIST_CASE] =...