Hii,

Define the vendor_stockinfo Field in product.supplierinfo

First, you correctly define the vendor_stockinfo field in the product.supplierinfo model.

class SupplierInherit(models.Model):
    _inherit = 'product.supplierinfo'

    vendor_stockinfo = fields.Integer(string="Vendor Stock")

Modify the product.supplierinfo Tree View to Display vendor_stockinfo

Now, you need to modify the tree view for the product.supplierinfo model to display the vendor_stockinfo field. You can inherit and update the view like this:

<record id="inherit_supplierinfo_tree_view_vendor_stockinfo" model="ir.ui.view">
    <field name="name">Add vendor_stockinfo to product_supplierinfo_tree_view</field>
    <field name="model">product.supplierinfo</field>
    <field name="inherit_id" ref="product.product_supplierinfo_tree_view"/>
    <field name="arch" type="xml">
        <xpath expr="//field[@name='product_code']" position="after">
            <field name="vendor_stockinfo"/>
        </xpath>
    </field>
</record>

Override the product.template Form View to Display the Custom Tree View

The seller_ids field in the product.template form view needs to be replaced with a custom tree view that includes the vendor_stockinfo field.

Here’s how to do it:

<record id="product_template_form_view_inherit_override_seller_ids" model="ir.ui.view">
    <field name="name">Override seller_ids with custom tree</field>
    <field name="model">product.template</field>
    <field name="inherit_id" ref="product.product_template_form_view"/>
    <field name="arch" type="xml">
        <xpath expr="//field[@name='seller_ids']" position="replace">
            <field name="seller_ids"
                   context="{'default_product_tmpl_id': id, 'list_view_ref': 'your_module.custom_supplierinfo_tree_view_with_vendor_stock'}"
                   nolabel="1"
                   invisible="product_variant_count &gt; 1"
                   readonly="product_variant_count &gt; 1"
            />
        </xpath>
    </field>
</record>

Define the Custom Tree View for product.supplierinfo

You need to create a custom tree view that includes the vendor_stockinfo field. Here’s how to define the tree view:

<record id="custom_supplierinfo_tree_view_with_vendor_stock" model="ir.ui.view">
    <field name="name">product.supplierinfo.tree.with.vendor.stock</field>
    <field name="model">product.supplierinfo</field>
    <field name="arch" type="xml">
        <tree>
            <field name="product_code"/>
            <field name="vendor_stockinfo"/>  <!-- Your custom field here -->
            <field name="price"/>
            <field name="min_qty"/>
            <!-- Add other necessary fields here -->
        </tree>
    </field>
</record>

Ensure Your Module is Loaded Correctly

Make sure your module's manifest file references the correct XML files, and then update your module.

__manifest__.py:

{
    'name': 'Plantillas Personalizadas',
    'version': '1.0',
    'summary': 'Plantillas Servicio Externo',
    'description': 'Aplicación que guarda las plantillas para la aplicación servicio externo',
    'depends': ['product'],
    'data': [
        'views/worksheet_template_views.xml',  # Your custom view file
        'views/product_template_form_view_inherit.xml',  # Form view inheritance
    ],
    'license': 'LGPL-3',
}

i hope it is use full