Additional structures in TC vanish if paird with any other mod?

I created some variation of ramps and walls within my total conversion mod
pretty much following this howto:

they work fine if i start the TC alone, but vanish (engram entries) as soon as i add any other stackable mod that adds engrams

anyone knows why?

so, as a workaround:
the only way to add structures inside a TC and still allowing normal mods. you have to add your new entrys to the main lists. not the additional ones