Sorry Anand your code breaks inheritance as it calls osv.osv.create directly. The proper call would be return super(class_name, self).create(cr, user, vals, context=context) on v7.

yes... you are right... thanks....Ivan

write will be executed when an existing record is updated. Note that for write the vals in the method's argument will only contain those data that are updated. So, you might want to read/browse first if you need those data. Also write operates on multiple records (ids in the argument). create is called when a new record is created, the vals argument will contain all fields that are to be written and no ids in the arguments.

You are very clear. I have understand perfectly. Thanks!

Sorry, in the case of write, why the ids are a collection? If I am updating a single record

It is just the way Odoo is written Jose. write expects a list for ids arguments. If you just updates one record, you put it in a list. pool.write(cr, uid, [id], vals, context=context). That'll do.