Hello,

 I built a view like this, in which I would like to filter the lines of the Notebook (O2M), following the values ​​that I will select at the main field of the view ( banque and projet) . as i have dificulties to put image here, you can see my screenshot \here ( \https://www.developpez.net/forums/d2011774/logiciels/solutions-d-entreprise/erp/odoo-ex-openerp/filtrer-one2many-l-aide-d-chant-many2one-odoo12/ ).  

view code:  

{{<record id="view_btp_etatcaution_form" model="ir.ui.view">
            <field name="name">etatcaution</field>
            <field name="model">btp.etatcaution</field>
            <field name="arch" type="xml">
				 <form string="etatcaution" class="oe_form_configuration" create="false">
                  ...
					<sheet>
						<group>
							<field name="banque_id" class="oe_inline"/>
							<field name="projet_id" class="oe_inline"/>
						</group>
					</sheet>
					<notebook>
                        <page string="Etat caution">
 
                                <field name="ligne_caution_etat" widget="select">
 
                                    <tree editable="bottom" string="Etat caution" create="false">
 
                                        <field name="name"/>
										....
										<field name="banque_id"  domain="[('banque_id', '=', parent.banque_id)]"/>
										<field name="projet_id" domain="[('projet_id', '=', parent.projet_id)]" />
										<field name="date_debut"/>
										....
                                    </tree>
                                </field>
                        </page>
				    </notebook>
                </form>
            </field>
        </record>
		 <record id="action_etatcaution" model="ir.actions.act_window">
			<field name="name">etatcaution</field>
			<field name="type">ir.actions.act_window</field>
			<field name="res_model">btp.etatcaution</field>
			<field name="view_type">form</field>
			<field name="view_mode">tree,form</field>
			<field name="res_id">1</field>
			<field name="view_id" ref="view_btp_etatcaution_form"/>
		</record>}}

i dont know why this part doesn't filter my list:

{{ <field name="banque_id"  domain="[('banque_id', '=', parent.banque_id)]"/>
<field name="projet_id" domain="[('projet_id', '=', parent.projet_id)]" /> }}