I told a friend I would try to help him figure out a problem by seeing if any of you genius' knew.
They are trying to create a wall type that has an exterior plaster and lathe that is green in color, structure is concrete, and interior is also plaster and lathe but white. It seems that they can't make one white and one green, if they change 1 the other will automatically change to the same color and they shouldn't be doing that because they are two totally different faces.
Any help is much appreciated, if someone fixes the issue. I will toss them some fg.