[FIX] purchase_mrp: split cost in bom line

Steps to reproduce:
- Create Storable Product "Super Test" with Cost of $1.
- Create Storable Product "Pack of Super Test" with Cost of $10.
- Create a Kit BoM that produces 1 "Pack of Super Test" from 10 "Super Test".
- Ensure product category on both products is set to Automated FIFO Inventory Valuation.
- Create a PO for 20 "Pack of Super Test" and confirm.
- Process the Delivery and look at inventory valuation.
- See that "Super Test" has moved quantity at 200 with Unit Value of 10 each (taken from kit product!).

Bug:
cost isn't split on the qty of the bom line

Fix:
take product quantities of the bom into consideration

opw-3453703

closes odoo/odoo#132186

Signed-off-by: William Henrotin (whe) <whe@odoo.com>

addons/purchase_mrp/models/mrp_bom.py

@@ -32,7 +32,7 @@ class MrpBomLine(models.Model):
     def _get_cost_share(self):
         self.ensure_one()
         if self.cost_share:
-            return fields.Float.round(self.cost_share / 100, 2)
+            return self.cost_share / 100
         bom = self.bom_id
         bom_lines_without_cost_share = bom.bom_line_ids.filtered(lambda bl: not bl.cost_share)
-        return fields.Float.round(1 / len(bom_lines_without_cost_share), 2)
+        return 1 / len(bom_lines_without_cost_share)

addons/purchase_mrp/models/stock_move.py

 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
-from dateutil.relativedelta import relativedelta
 from odoo import _, models
-from odoo.tools.float_utils import float_is_zero
+from odoo.tools.float_utils import float_is_zero, float_round
 from odoo.exceptions import UserError
 
 
@@ -22,7 +21,8 @@ class StockMove(models.Model):
         line = self.purchase_line_id
         kit_price_unit = line._get_gross_price_unit()
         cost_share = self.bom_line_id._get_cost_share()
-        return kit_price_unit * cost_share
+        price_unit_prec = self.env['decimal.precision'].precision_get('Product Price')
+        return float_round(kit_price_unit * cost_share * line.product_qty / self.product_qty, precision_digits=price_unit_prec)
 
     def _get_valuation_price_and_qty(self, related_aml, to_curr):
         valuation_price_unit_total, valuation_total_qty = super()._get_valuation_price_and_qty(related_aml, to_curr)

addons/purchase_mrp/tests/test_purchase_mrp_flow.py

@@ -215,6 +215,34 @@ class TestPurchaseMrpFlow(TransactionCase):
             move_line.qty_done = qty_to_process[comp][0]
             move._action_done()
 
+    def test_kit_component_cost(self):
+        # Set kit and componnet product to automated FIFO
+        self.kit_1.categ_id.property_cost_method = 'fifo'
+        self.kit_1.categ_id.property_valuation = 'real_time'
+
+        self.kit_1.bom_ids.product_qty = 3
+
+        po = Form(self.env['purchase.order'])
+        po.partner_id = self.env['res.partner'].create({'name': 'Testy'})
+        with po.order_line.new() as line:
+            line.product_id = self.kit_1
+            line.product_qty = 120
+            line.price_unit = 1260
+        po = po.save()
+        po.button_confirm()
+        po.picking_ids.action_set_quantities_to_reservation()
+        po.picking_ids.button_validate()
+
+        # Unit price equaly dived among bom lines (cost share not set)
+        # # price further divided by product qty of each component
+        components = [
+            self.component_a,
+            self.component_b,
+            self.component_c,
+        ]
+
+        self.assertEqual(sum([k.standard_price * k.qty_available for k in components]), 120 * 1260)
+
     def test_01_sale_mrp_kit_qty_delivered(self):
         """ Test that the quantities delivered are correct when
         a kit with subkits is ordered with multiple backorders and returns