[IMP] stock_picking_batch_custom: order detailed ops by category, product, partner

Override _order on stock.move.line using the existing stored Many2one fields.
Odoo JOINs product.category and uses its _order (complete_name, which is stored)
so the full category path is used for sorting without any extra fields.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

stock_picking_batch_custom/models/stock_move_line.py

@@ -8,6 +8,7 @@ from odoo import models
 
 class StockMoveLine(models.Model):
     _inherit = "stock.move.line"
+    _order = "product_categ_id, product_id, picking_partner_id, id"
 
     product_categ_id = fields.Many2one(
         comodel_name="product.category",
@@ -17,13 +18,6 @@ class StockMoveLine(models.Model):
         readonly=True,
     )
 
-    product_categ_complete_name = fields.Char(
-        string="Product Category Path",
-        related="product_id.categ_id.complete_name",
-        store=True,
-        readonly=True,
-    )
-
     product_default_code = fields.Char(
         string="Product Code",
         related="product_id.default_code",

stock_picking_batch_custom/views/stock_picking_batch_views.xml

@@ -47,7 +47,7 @@
         <field name="inherit_id" ref="stock_picking_batch.view_move_line_tree"/>
         <field name="arch" type="xml">
             <xpath expr="//list" position="attributes">
-                <attribute name="default_order">product_categ_complete_name,product_id,picking_partner_id</attribute>
+                <attribute name="default_order">product_categ_id,product_id,picking_partner_id</attribute>
                 <attribute name="class">o_batch_move_line_list</attribute>
             </xpath>
             <xpath expr="//field[@name='product_id']" position="before">