is there a way to comp togheter a vrayedgestex map and a vraynormal map?
… if not, do you know any workaround or do I have to switch back to bump maps?
did you try using max MIX map?
Used the Mix map for that for a few times now, worked well.
thanks guys for your answers; this trick really works
As I have always used the vray comp map for tha bump plus edges, when I realized that it didn’t work with normals I thought there was a sort of incompatibility among vraynormal and vrayedgestex so I didn’t test others composition maps. 
I comped together two different normal maps using the vraycomp map some time ago, that worked too. Not sure about normalmap + edge texture tho…