[support] view from different content types (views3)

I was trying to create a view from two different content types, joining on a certain field. Both of the content types have a database id, which is unique in one of them (sequences), and not unique in the other one (clusters). I want to create a views of all nodes with certain search criteria from the clusters content type, but include another field from the sequences content type (annotation).

It didn't look like I could do that in a standard views3 way, and would probably require a custom module. However, I am time pressed (no time for anything custom here), and would like to also use the exposed search capabilities in views. Anything I overlooked?

Thanks, Ursula