It sounds like you have cascading parameters and PPCQuery is a dataset that populates a parameter that is dependent on the value(s) in you are selecting in the Division parameter. You need to re-code the filter expression PPCQuery to handle a multi-select parameter. I'm guessing the expression is something like this:

=Parameter!Division.Value

and you need to account for the fact that the multi-select parameter's value is now an array so you need something like:

=Parameter!Division.Value(1)

I haven't worked with this is awhile but if you Bing\Google working with SSRS multvalue parameters you should find what you need to make it work.