Multiple flow objects in Smoke domain. Is it possible?

I have to do an animation of an asteroid hitting the earth. I already have a Smoke domain with a flow object representing the explosion. When I add a particle system to the asteroid object and set it as a Flow object, I don’t get any smoke emitting from the particles. I have already free’d the bake. Any idea what’s going wrong? It should be possible to have multiple flow objects in one domain, right?

Can you upload de file of blender ? It’s easier to see the problem.

I updatedRe:ticular just for this purpose.

Yes, Atom, but how did you do that? I have two flow objects inside the Domain object but only one of them is producing smoke.