used defined material with with geo gym for GSA

hi to everybody,

I am trying to assign a custom defined material to some elements with a geogym component, but once I bake it to GSA, here, every section has steel associate to it.

This happen also when I assign aluminium to other members, once in GSA, their relative sections are associated in steel.

It seems that when I am associating to the section the material, then association during the baking process doesn't work: do you know how to solve this? Am I doing something wrong?

I post here 2 shots of the definition.

Thank you in advance for your help,

Matteo