Changing pivot position does not affect the exported mesh

I have exported a mesh representing a truck having its original pivot centered in the fore wheels axis.
I wanted to change the pivot and move it to the rear wheels axis.
I have hit the "affect pivot only" button and reposition the pivot where I wanted.
I exported the mesh again but when I view it with ogre nothing changes.
What shall I look into?

Many thanks.

Are you using the .mesh file directly or laoding them via osm scene files?

If using meshes directly, test by reseting the xform