I'm finding when passing the parameters it fills it out correctly but seems to create almost another value. If I manually go and select the second value then the filter works, otherwise it's not seeing it correctly.  My guess is its something like passing report filters where for the first filter you use pvo.

I click my button on the Products related list on an opportunity. The button contains the below url
Ex:
https://cs14.salesforce.com/p/opp/SelectSearch?addTo=006c00000079xsa&PricebookEntrycol0=Product Family&PricebookEntryoper0=contains&PricebookEntryfval0=Consulting&PricebookEntrycol1=Global Product&PricebookEntryoper1=equals&PricebookEntryfval1=false&retURL=%2F006c00000079xsa

Where

PricebookEntrycol0=Product Family
PricebookEntryoper0=contains
PricebookEntryfval0=Consulting

However I get multiple Product Familys and the filter doesn't work. If I manually go select the second "Product Family" in the drop down the filter works. Should I be using different values?

Thanks

Dahveed