Hi to all, in wiki, http://wiki.koha-community.org/wiki/DB_Schema#Sectorial_Schemas I have insert information about relation beetwen SQL table for ACQ module. The pdf file is genereted with MySQL Workbench source file. I don't find any better tool to draw an ER schema. To show imlplicit reletions I need to isert false foregin keys. So don't use MySQL Workbench file to generate Koha sql file. Bye Zeno Tajoli