stock-rma/rma/wizards/rma_make_picking_view.xml

<?xml version="1.0"?>

<odoo>
    <record id="view_rma_picking" model="ir.ui.view">
        <field name="name">rma_picking</field>
        <field name="model">rma_make_picking.wizard</field>
        <field name="arch" type="xml">
            <form string="Select lines for picking" name="lines">
                <separator string="Select lines for picking"/>
                <field name="item_ids">
                    <tree string="RMA Lines" editable="bottom" create="false">
                        <field name="rma_id"/>
                        <field name="product_id"/>
                        <field name="product_qty"/>
                        <field name="uom_id" groups="product.group_uom"/>
                        <field name="qty_to_receive" readonly="0"/>
                    </tree>
                </field>
                <footer>
                    <button
                            string="Confirm"
                            name="action_create_picking" type="object"
                            class="oe_highlight"/>
                    or
                    <button name="action_cancel"
                            string="Cancel" class="oe_link" special="cancel"/>
                </footer>
            </form>
        </field>
    </record>

    <record id="view_rma_picking_out" model="ir.ui.view">
        <field name="name">Create Delivery</field>
        <field name="model">rma_make_picking.wizard</field>
        <field name="arch" type="xml">
            <form string="Select lines for picking" name="lines">
                <separator string="Select lines for picking"/>
                <field name="item_ids">
                    <tree string="RMA Lines" editable="bottom" create="false">
                        <field name="rma_id"/>
                        <field name="product_id"/>
                        <field name="product_qty"/>
                        <field name="uom_id" groups="product.group_uom"/>
                        <field name="qty_to_deliver" readonly="0"/>
                    </tree>
                </field>
                <footer>
                    <button
                            string="Confirm"
                            name="action_create_picking" type="object"
                            class="oe_highlight"/>
                    or
                    <button name="action_cancel"
                            string="Cancel" class="oe_link" special="cancel"/>
                </footer>
            </form>
        </field>
    </record>

    <record id="action_rma_picking_in" model="ir.actions.act_window">
        <field name="name">Create Incoming Shipment</field>
        <field name="type">ir.actions.act_window</field>
        <field name="res_model">rma_make_picking.wizard</field>
        <field name="view_type">form</field>
        <field name="view_mode">form</field>
        <field name="target">new</field>
        <field name="view_id" ref="view_rma_picking"/>
        <field name="groups_id" eval="[(4, ref('stock.group_stock_user'))]"/>
        <field name="context">{'picking_type': 'incoming'}</field>
        <field name="binding_model_id" ref="rma.model_rma_order_line"/>
    </record>

    <record id="action_rma_picking_out" model="ir.actions.act_window">
        <field name="name">Create Delivery</field>
        <field name="type">ir.actions.act_window</field>
        <field name="res_model">rma_make_picking.wizard</field>
        <field name="view_type">form</field>
        <field name="view_mode">form</field>
        <field name="target">new</field>
        <field name="view_id" ref="view_rma_picking_out"/>
        <field name="groups_id" eval="[(4, ref('stock.group_stock_user'))]"/>
        <field name="context">{'picking_type': 'outgoing'}</field>
        <field name="binding_model_id" ref="rma.model_rma_order_line"/>
    </record>

    <record id="view_rma_line_button_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">
            <header position="inside">
                <button name="%(action_rma_picking_in)d" states="approved"
                        string="Create Incoming Shipment" class="oe_highlight"
                        type="action"/>
                <button name="%(action_rma_picking_out)d" states="approved"
                        string="Create Delivery" class="oe_highlight"
                        type="action"/>
            </header>
        </field>
    </record>

    <record id="view_rma_line_supplier_button_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">
            <header position="inside">
                <button name="%(action_rma_picking_in)d" states="approved"
                        string="Create Incoming Shipment" class="oe_highlight"
                        type="action"/>
                <button name="%(action_rma_picking_out)d" states="approved"
                        string="Create Delivery" class="oe_highlight"
                        type="action"/>
            </header>
        </field>
    </record>

</odoo>