Generative Structure Analysis: restrain reaction error

[spacefun]

Hi all,
I'm trying to do a simple simulation with CATIA.

I have a beam with two pivots on two double-end holes: there is no restrain for rotating around axis hole.
A distributed force (2000N) acts perpendicular to the hole axes. I hope the image attached helps to understand.

The problem is that when I calculated the reaction (after computing) I got a moment (500Nxm) also around the axis hole: how is it possible? Where is the problem?

Thanks

 

[spacefun]

No one could help me?