stock-rma/rma_sale/views/rma_order_line_view.xml

<?xml version="1.0" encoding="utf-8" ?>
<odoo>

        <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">
                <div name='button_box' position="inside">
                    <button
                    type="object"
                    name="action_view_sale_order"
                    class="oe_stat_button"
                    icon="fa-strikethrough"
                    groups="sales_team.group_sale_salesman_all_leads"
                >
                            <field
                        name="sales_count"
                        widget="statinfo"
                        string="Sales Orders"
                    />
                    </button>
                </div>
                <group name="main_info" position="inside">
                    <field
                    name="sale_line_id"
                    context="{'rma': True}"
                    options="{'no_create': True}"
                />
                </group>
                <group name="quantities" position="inside">
                    <group>
                        <field name="qty_to_sell" />
                        <field name="qty_sold" />
                    </group>
                </group>
                <field name="delivery_policy" position="after">
                    <field name="sale_policy" />
                </field>
                <field name="origin" position="after">
                    <field
                    name="sale_id"
                    attrs="{'invisible': [('sale_line_id', '=', False)]}"
                />
                </field>
                <notebook position="inside">
                    <page name="sale" string="Sale Lines">
                        <field name="sale_line_ids" nolabel="1" />
                    </page>
                </notebook>
            </field>
        </record>

        <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">
                <div name='button_box' position="inside">
                    <button
                    type="object"
                    name="action_view_sale_order"
                    class="oe_stat_button"
                    icon="fa-strikethrough"
                    groups="sales_team.group_sale_salesman_all_leads"
                >
                            <field
                        name="sales_count"
                        widget="statinfo"
                        string="Sales Orders"
                    />
                    </button>
                </div>
                <group name="quantities" position="inside">
                    <group>
                        <field name="qty_to_sell" />
                        <field name="qty_sold" />
                    </group>
                </group>
                <field name="delivery_policy" position="after">
                    <field name="sale_policy" />
                </field>
                <notebook position="inside">
                    <page name="sale" string="Sale Lines">
                        <field name="sale_line_ids" nolabel="1" />
                    </page>
                </notebook>
            </field>
        </record>

    <record id="view_rma_line_button_sale_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_button_form" />
        <field name="arch" type="xml">
            <header position="inside">
                <button
                    name="%(action_rma_order_line_make_sale_order)d"
                    states="approved"
                    string="Create Sales Quotation"
                    class="oe_highlight"
                    type="action"
                />
            </header>
        </field>
    </record>
    <record id="view_rma_line_supplier_button_sale_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_button_form" />
        <field name="arch" type="xml">
            <header position="inside">
                <button
                    name="%(action_rma_order_line_make_sale_order)d"
                    states="approved"
                    string="Create Sales Quotation"
                    class="oe_highlight"
                    type="action"
                />
            </header>
        </field>
    </record>

    <record id="view_rma_rma_line_filter" model="ir.ui.view">
        <field name="name">rma.order.line.select - rma_sale</field>
        <field name="model">rma.order.line</field>
        <field name="inherit_id" ref="rma.view_rma_rma_line_filter" />
        <field name="arch" type="xml">
            <group name="stock_quantities" position="after">
                <group
                    name="sale_quantities"
                    groups="sales_team.group_sale_salesman"
                >
                    <filter
                        domain="[('state','!=', 'done'),('qty_to_sell','>',0.0)]"
                        help="To Sell"
                        name="to_sell"
                    />
                </group>
            </group>
        </field>
    </record>

</odoo>