stock-rma/rma_account/views/rma_order_line_view.xml

<?xml version="1.0" ?>
<odoo>
    <record id="view_rma_line_supplier_form" model="ir.ui.view">
        <field name="name">rma.order.line.supplier.form</field>
        <field name="model">rma.order.line</field>
        <field name="inherit_id" ref="rma.view_rma_line_supplier_form" />
        <field name="arch" type="xml">
            <button name="action_view_out_shipments" position="after">
                <button
                    type="object"
                    name="action_view_invoice"
                    class="oe_stat_button"
                    icon="fa-pencil-square-o"
                    string="Origin Inv"
                >
                </button>
                <button
                    type="object"
                    name="action_view_refunds"
                    class="oe_stat_button"
                    icon="fa-pencil-square-o"
                    groups="account.group_account_user"
                >
                        <field name="refund_count" widget="statinfo" string="Refunds" />
                    </button>
            </button>
            <group name="main_info" position="inside">
                <field
                    name="account_move_line_id"
                    options="{'no_create': True}"
                    context="{'rma': True}"
                    domain="[('move_id.move_type', 'not in', ['entry','out_invoice','out_refund']), '|',
                                ('move_id.partner_id', '=', partner_id),
                                ('move_id.partner_id', 'child_of', partner_id)]"
                />
            </group>
            <field name="operation_id" position="after">
                <field name="refund_policy" />
            </field>
            <page name="stock" position="after">
                <page name="refunds" string="Refunds">
                    <field name="refund_line_ids" nolabel="1" />
                </page>
            </page>
            <field name="delivery_address_id" position="after">
                <field
                    name="invoice_address_id"
                    groups='rma.group_rma_delivery_invoice_address'
                />
            </field>
            <group name="deliver" position="after">
                <group name="refund">
                    <field name="qty_to_refund" />
                    <field name="qty_refunded" />
                </group>
            </group>
        </field>
    </record>

    <record id="view_rma_line_form" model="ir.ui.view">
        <field name="name">rma.order.line.form</field>
        <field name="model">rma.order.line</field>
        <field name="inherit_id" ref="rma.view_rma_line_form" />
        <field name="arch" type="xml">
            <button name="action_view_out_shipments" position="after">
                <button
                    type="object"
                    name="action_view_invoice"
                    class="oe_stat_button"
                    icon="fa-pencil-square-o"
                    string="Origin Inv"
                >
                </button>
                 <button
                    type="object"
                    name="action_view_refunds"
                    class="oe_stat_button"
                    icon="fa-pencil-square-o"
                    groups="account.group_account_user"
                >
                        <field name="refund_count" widget="statinfo" string="Refunds" />
                    </button>
            </button>
            <group name="main_info" position="inside">
                <field
                    name="account_move_line_id"
                    options="{'no_create': True}"
                    context="{'rma': True}"
                    domain="[('move_id.move_type', '!=', 'entry'), '|',
                                ('move_id.partner_id', '=', partner_id),
                                ('move_id.partner_id', 'child_of', partner_id)]"
                />
            </group>
            <field name="operation_id" position="after">
                <field name="refund_policy" />
            </field>
            <page name="stock" position="after">
                <page name="refunds" string="Refunds">
                    <field name="refund_line_ids" nolabel="1" />
                </page>
            </page>
            <field name="delivery_address_id" position="after">
                <field
                    name="invoice_address_id"
                    groups='rma.group_rma_delivery_invoice_address'
                />
            </field>
            <group name="supplier_rma" position="after">
                <group name="refund">
                    <field name="qty_to_refund" />
                    <field name="qty_refunded" />
                </group>
            </group>
        </field>
    </record>

    <record id="view_rma_rma_line_filter" model="ir.ui.view">
        <field name="name">rma.order.line.select</field>
        <field name="model">rma.order.line</field>
        <field name="inherit_id" ref="rma.view_rma_rma_line_filter" />
        <field name="arch" type="xml">
            <field name="product_id" position="after">
                <filter
                    name="to_refund"
                    string="To Refund"
                    domain="[('qty_to_refund', '>', 0)]"
                    context="{'group_by':'partner_id'}"
                />
            </field>
        </field>
    </record>
</odoo>