Kados & slef, Slef asked me "could you give me an example of something that can't be ruled only by SQL during update". I answered I had found one, but could not remember it. I have got it now ! When dealing with something that depends on language and/or MARC flavour. For example, I want to add a systempref for Reserve behaviour (to fix http://bugs.koha.org/cgi-bin/bugzilla/show_bug.cgi?id=1416) If langage is french, i'll add something, otherwise i'll add something else. I add it now, but i'm afraid I won't have time to commit before the end of the day (need to merge to official branch, fix errors and send patch) -- Paul POULAIN et Henri Damien LAURENT Consultants indépendants en logiciels libres et bibliothéconomie (http://www.koha-fr.org) Tel : 04 91 31 45 19