Use relationship for Views taxonomy term filter I'm using the Commerce module, and I'm trying to create a view that displays the nodes with several exposed filters that should apply for the products.

Now, the node has a term field that references to a category. A normal taxonomy term filter works just fine for this case.

The products has a term field that references to a color.

What I would like to do is adding another taxonomy term filter for the color vocabulary (just like the one described above) that uses a relationship to the product. AFAIK, it's not possible to use a relationship for a taxonomy term filter.

Can I achieve what I am trying, in any way?

I'm using Drupal 7.2 and Views 3-beta3.
I've been able to do this with a simple "Content: Referenced product" relationship in my view. If you try using any of the "Content: xxxxx" filter fields, they won't work, as you're noting here. So, "Content: has taxonomy term ID," won't let you choose the relationship.
However, if you use the "Commerce Product: xxxx" (where xxxx is the term refrerence field) field for your contextual filter, it'll work with the relationship.