i want to disable the "add one line" in a many2many tags tree after adding one single line ? is that possible ? i tried 

                                    <field name="indication_ids" >

                                    <tree editable="bottom"  options="{'no_create_edit': True}" >

                                        <field name="motor_vehicule"/>

                                        <field name="steel_griders"/>

                                        <field name="wood"/>

                                            </tree>

                                </field>

but it disables the "add one line" totally, not allowing me to add a single line