Ooops! I didn't see your message that you were able to solve your problem. Oh well, this pose might help someone else. ;o))

The fastest way to solve this kind of problem where you can't delete something in the material room is to load a primitive prop, select the first material that you see in material room, and save the material as a single material. Then you load the product you're having a problem with and apply that single material to it. Then you save it.

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