Thanks for your answers.
2) Yes, i knew that thing but it's not a technical sheet that i can send to the manufacter. So, I understand Cadstar can't produce one automatically and that i must do it my self.
1) You are totally right, one was already existing and not displayed correctly on the screen.. my bad ! (and i had checked it twice before asking you ...
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Others questions:
1) in batch process, there is 2 kind of drill output files: platted and not platted holes.. which i understand.. but i don't manage to make a coulour file in adequation with it, meaning display from one part platted holes and from another part non platted holes..
2) i wanted to produce top_elec/bot_elec gerbers also in pdf to have a view of it (it is always useful to check any update between 2 version, or just have a global overview of a copper layer).
In the batch process, which i used to produce the gerber files, when i select the same colour/report file but PDF file as a device type, i don't have a new output file in the list to let me select it instead of top_elec.gbr. I was expecting a top_elec.pdf for example but it's not proposed and when i start the batch, it tells (obviously) me that "Duplicate Output File Name", so how to handle that?
Indeed, i have the same issue for each pdf files i want: top and bot assembly, top and bot paste, top and bot soldermask..