What is wrong with railings in Archicad library?

[Anonymous]

I met this problem with rail (stair handrail, free rail, etc) in all versions of AC I ever had: If I try to change the material of post, it automatically changes to "brick" and the parameter changes to "locked". All other material parameters behave standardly.

I even tried to look in the GDL script, but there is no restriction for parameter "matp" (neither in macro script). Maybe the problem is deeper in the library scripts, but I am not quite good in GDL to find it.

Is there any known solution? Or does anybody have an idea how to manage this?