Hello,

Im trying to remove/hide the "Add a line" link and the 'delete' button in one2many tree view base on the condition of the state. 

Ex: They just appear in the state: 'draft. When changing the state, they will be hidden/remove!

model_b.py :

name = fields.Many2one('hr.employee')

o_2_m = fields.One2many('model.a', 'keya')

state = fields.Selection([

            ('draft', 'DRAF'),

            ('confirm', 'CONFIRMED'),

            (cancel', 'CANCEL'),

            ],default='draf')

model_a.py :

name = fields.Many2one('hr.employee')

keya = fields.Many2one('model.b')

num_1 = fields.Float('Number')

ref_1 = fields.Char('Reference')

I'd tried to set 'readonly' for all related field in file XML:

<notebook>

                            <page name="Want_to_hide_button" string="Test">

                                <field name="o_2_m" options="{'no_create': True}" widget='many2many'>

                                    <tree string="ABC DEF">

                                        <field name="state" invisible="1"/>

                                         <field name="name" attrs="{'readonly':[('state' , '!=', 'draft')]}"/>

                                         <field name="num_1" widget="monetary" attrs="{'readonly':[('state' , '!=', 'draft')]}"/>

                                         <field name="ref_1" attrs="{'readonly':[('state' , '!=', 'draft')]}"/>

                                         <field name="currency_id" invisible="1"/>

                                    </tree>

                                </field>

                           </page>

</notebook>

But it still not worked.

Please help.

Thank you!