The function "Write" after new o2m record don't update form and don't be saved

class A(osv.osv):
    _name="A"

    def write(self, cr, uid, ids, vals, context=None):
        eval = vals.get('b_ids', 0)
        for item in eval:
            vals['state_a'] = eval[i][2]['state_b']
        return super(A, self).write(cr, uid, ids, vals, context)

    _columns={
        "name": fields.char('Name', size=25 ),
        "b_ids": fields.one2many('B', 'a_id', 'Evals' ),
        "state_a": fields.selection([("O","Open"), ("C","Close")], 'State'),
        }
A()

class B(osv.osv):
    _name='B'

    _columns={
        "name": fields.char('Name', size=25 ),
        "a_id": fields.many2one('A'),
        "state_b": fields.selection([("O","Open"), ("C","Close")], 'State'),
        }

    _defaults = {
        'a_id': lambda self, cr, uid, context: context.get('a', False),
    }

B()

-In the form of the A object i have a o2m grid with its B objects.
-Now i create a new B object from the grid.
-The write function of the A object is called and the new value of "state" is stored in the database but not displayed in the form.
-If i press the cancel button of the form the new value of the "state" field is displayed but if i press the save button the new value is deleted from the database and not displayed in the saved form.

This behavior does not happen in the GTK client.

Hello David Diz,

Please consider the following help link before developing module.

   http://doc.openerp.com/developer/index.html#book-develop-link

I have made some following code improvement:

class a_a(osv.osv):
    _name="a.a"

    def write(self, cr, uid, ids, vals, context=None):
        eval = vals.get('b_ids', 0)
        for item in eval:
            vals['state_a'] = eval[i][2]['state_b']
        return super(a, self).write(cr, uid, ids, vals, context)

    _columns={
        "name": fields.char('Name', size=25 ),
        "b_ids": fields.one2many('b.b', 'a_id', 'Evals' ),
        "state_a": fields.selection([("openerp","Open"), ("C","Close")], 'State'),
        }
a_a()

class b_b(osv.osv):
    _name='b.b'

    _columns={
        "name": fields.char('Name', size=25 ),
        "a_id": fields.many2one('a.a','A_id'),
        "state_b": fields.selection([("O","Open"), ("C","Close")], 'State'),
        }

    _defaults = {
        'a_id': lambda self, cr, uid, context: context.get('a', False),
    }
b_b()

Thanks.