[iostrym]

thank for your answer. But in fact what I'm trying to do is to set a version number like "V1" in a metadata of my pdf and I would like calibre when importing my pdf display my version number V1 in the ISBN column.
because I'm using ISBN metadata like a version number.
For epub there is no problem because isbn metadata is correctly imported from the epub but for pdf as this metadata doesn't exist...

and concerning my keyword problem, it could be great if we could configure in calibre that not only "," can separate keywords but also ";" or others symbols. Because my ### pdf editor want only separate keywords with ";" ... but maybe there is a plugin for this...