Basics

 Values: (0, 0,  { fields })    create
         (1, ID, { fields })    modification
         (2, ID)                remove (delete)
         (3, ID)                unlink one (target id or target of relation)
         (4, ID)                link
         (5)                    unlink all (only valid for one2many)
 

fields.many2one -> thats to make a searchfiled with wich the user can chose an item (there are alow others -> see osv/fields.py)