Thank you for your reply.
I was also confused by the different descriptions of ENABLE_RENDER in the english and the german manual:
The english version sais "the entity" while the german version sais "sämtliche...Entities/all...entities".

If I'm not mistaken entSkill41 respectivly vecSkill41 cant be used in material events?

Perhaps I should use a shader instead, as I need to shift the texture as well.