addons-meggit/base_meggit/views/product.xml

<?xml version="1.0"?>
<odoo>
	<data>

		<record id="product_template_base_meggit_view" model="ir.ui.view">
	        <field name="name">product.template.base.meggit.form</field>
	        <field name="model">product.template</field>
	        <field name="inherit_id" ref="product.product_template_only_form_view"/>
	        <field name="arch" type="xml">
	        	<field name="barcode" position="after">
	        		<field name="segment_id" attrs="{'invisible': [('product_variant_count', '>', 1)]}" options="{'no_open': 1, 'no_create': 1}"/>
	        		<field name="platform" attrs="{'invisible': [('product_variant_count', '>', 1)]}"/>
	        		<field name="site" attrs="{'invisible': [('product_variant_count', '>', 1)]}"/>
	        		<field name="custom_sales_id" attrs="{'invisible': [('product_variant_count', '>', 1)]}"/>
	        		<field name="custom_sales" invisible="1"/>
	        	</field>
	        </field>
	    </record>

	    <record id="product_normal_form_base_meggit_view" model="ir.ui.view">
            <field name="name">product.product.base.meggit.form</field>
            <field name="model">product.product</field>
            <field name="inherit_id" ref="product.product_normal_form_view"/>
            <field name="arch" type="xml">
            	<field name="barcode" position="after">
	        		<field name="segment_id" options="{'no_open': 1, 'no_create': 1}"/>
	        		<field name="platform"/>
	        		<field name="site"/>
	        		<field name="custom_sales_id"/>
	        		<field name="custom_sales" invisible="1"/>
	        	</field>
            </field>
        </record>

        <record id="product_template_custom_sales_action" model="ir.actions.act_window">
	        <field name="name">Products</field>
	        <field name="type">ir.actions.act_window</field>
	        <field name="res_model">product.template</field>
	        <field name="view_mode">kanban,tree,form</field>
	        <field name="view_type">form</field>
	        <field name="view_id" ref="product.product_template_kanban_view"/>
	        <field name="context">{"search_default_filter_to_sell":1}</field>
	        <field name="domain">[('custom_sales','=',True)]</field>
	        <field name="help" type="html">
	            <p class="oe_view_nocontent_create">
	                Click to define a new product.
	            </p><p>
	                You must define a product for everything you sell, whether it's a physical product, a consumable or a service you offer to customers.
	            </p><p>
	                The product form contains information to simplify the sale process: price, notes in the quotation, accounting data, procurement methods, etc.
	            </p>
	        </field>
	    </record>
	</data>
</odoo>