Hello community,

How can I make a field readonly after save? It should not be editable after all.

I have try that with this, but it's not working at all.

product_reff = fields.Many2one('product.template', 'product_id', select=True)
is_created = fields.Boolean('Created')
def create(self, cr, uid, vals, context=None):

 vals['gio_is_created'] = True 
 lot = super(stock_production_lot, self).create(cr, uid, vals, context=context) 
 return lot

<field name="product_reff" position="attributes">
 <attribute name="attrs">{'readonly': [('is_created','=',True)]}</attribute> 
 </field>

Thank you