Actually, thinking about it you may have hit one of Posers foibles/quirks. If you are trying to get rid of part of the catsuit on say, the collars, with a trans map AND add a highlight to the same area as well, it appears it cant be done. The highlight seems to always get priority. Ive seen even marketplace items that have this problem of highlight and transmaps clashing, so even some Pros cant cure it. I would love to be proved wrong as I would like to do some more work on a hair item that would be massively improved by highlights.