Custom texture overide

[-WOODY-]

I may be wrong, but when setting up a scene with AC3D with an added custom texture, Pov-Ray merely layers this custom texture on top of the existing default AC3D textures.
I used to think that whatever additional textures are written in the object's property box would just overide the default textures when the scene is rendered so that only the second texture entry is read.
I noticed this when coming up with a custom Pov texture pattern. When I rendered it, Pov gave the warning that patterned textures cannot be layered on top of other textures so before I would render the scene I had to delete the original AC3D texture.