[FIX] mrp, sale_mrp: Avoid merging stock move different bom_line_id

Current behavior:
When using a product kit that have a product kit in his BoM some move line where merging when they shouldn't.
Because of this the delivered count wasn't correctly updated in any sale order using this product

Steps to reproduce:
- Create product B to manufacture with a BoM (type Kit) using component A and component B
- Create product A to manufacture with a BoM (type Kit) using product B and component A
- Create a sale order with product A
- Confirm the sale order and validate the delivery
- The delivered count of product A on the sale order stays at 0

opw-2777810

closes odoo/odoo#86083

Signed-off-by: Tiffany Chang <tic@odoo.com>

addons/mrp/models/stock_move.py

@@ -87,6 +87,12 @@ class StockMove(models.Model):
         .filtered(lambda ml: ml.qty_done == 0.0)\
         .write({'move_id': new_move, 'product_uom_qty': 0})
 
+    @api.model
+    def _prepare_merge_moves_distinct_fields(self):
+        distinct_fields = super()._prepare_merge_moves_distinct_fields()
+        distinct_fields.append('bom_line_id')
+        return distinct_fields
+
     @api.depends('raw_material_production_id.move_finished_ids.move_line_ids.lot_id')
     def _compute_order_finished_lot_ids(self):
         for move in self:

addons/sale_mrp/tests/test_sale_mrp_kit_bom.py

@@ -210,3 +210,69 @@ class TestSaleMrpKitBom(TransactionCase):
 
         # Checks the delivery amount (must be 10).
         self.assertEqual(so.order_line.qty_delivered, 10)
+
+    def test_qty_delivered_with_bom_using_kit(self):
+        """Check the quantity delivered, when one product is a kit
+        and his bom uses another product that is also a kit"""
+
+        self.kitA = self._create_product('Kit A', 'consu', 0.00)
+        self.kitB = self._create_product('Kit B', 'consu', 0.00)
+        self.compA = self._create_product('ComponentA', 'consu', 0.00)
+        self.compB = self._create_product('ComponentB', 'consu', 0.00)
+
+        # Create BoM for KitB
+        bom_product_formA = Form(self.env['mrp.bom'])
+        bom_product_formA.product_id = self.kitB
+        bom_product_formA.product_tmpl_id = self.kitB.product_tmpl_id
+        bom_product_formA.product_qty = 1.0
+        bom_product_formA.type = 'phantom'
+        with bom_product_formA.bom_line_ids.new() as bom_line:
+            bom_line.product_id = self.compA
+            bom_line.product_qty = 1
+        with bom_product_formA.bom_line_ids.new() as bom_line:
+            bom_line.product_id = self.compB
+            bom_line.product_qty = 1
+        self.bomA = bom_product_formA.save()
+
+        # Create BoM for KitA
+        bom_product_formB = Form(self.env['mrp.bom'])
+        bom_product_formB.product_id = self.kitA
+        bom_product_formB.product_tmpl_id = self.kitA.product_tmpl_id
+        bom_product_formB.product_qty = 1.0
+        bom_product_formB.type = 'phantom'
+        with bom_product_formB.bom_line_ids.new() as bom_line:
+            bom_line.product_id = self.compA
+            bom_line.product_qty = 1
+        with bom_product_formB.bom_line_ids.new() as bom_line:
+            bom_line.product_id = self.kitB
+            bom_line.product_qty = 1
+        self.bomB = bom_product_formB.save()
+
+        self.customer = self.env['res.partner'].create({
+            'name': 'customer',
+        })
+
+        so = self.env['sale.order'].create({
+            'partner_id': self.customer.id,
+            'order_line': [
+                (0, 0, {
+                    'name': self.kitA.name,
+                    'product_id': self.kitA.id,
+                    'product_uom_qty': 1.0,
+                    'product_uom': self.kitA.uom_id.id,
+                    'price_unit': 1,
+                    'tax_id': False,
+                })],
+        })
+        so.action_confirm()
+
+        self.assertTrue(so.picking_ids)
+        self.assertEqual(so.order_line.qty_delivered, 0)
+
+        picking = so.picking_ids
+        action = picking.button_validate()
+        wizard = self.env[action['res_model']].browse(action['res_id'])
+        wizard.process()
+
+        # Checks the delivery amount (must be 1).
+        self.assertEqual(so.order_line.qty_delivered, 1)