I try to understand very well how the 1.1 version of koha works (the exact structure of the DB). I wrote a few words for every table. I will enhance the doc in the future, as I understand better everything. By the way, a few tables remains un-understandable to me, so if someone could lighten me ;-) Last word : many tables seems useless, so if you confirm they are, I could add a "drop table" to my SQL patch. Bye -- Paul