How can I use my purchase history as a campaign filter?

Hi,

We are just starting the Responsys implementation, so this is may be a basic question: We wanted to send campagins using our purchase history (Eg: "Customer who purchased a specific product within the last 6 months"), but our purchase history, since it's a 1:M relationship, is in a "Purchase" Supplemental Table, and we can't use Supplemental Tables in filters...

So how could we do this basic targeting in Responsys?

Thanks in advice,

David