[FIX] mrp: handle unbuild/scrap/unscrap and production with same serial

When a product has been unbuilt and also (mistakenly) scrapped, it's
impossible to reuse the serial number in production again, even if the
product is unscrapped.

This fixes the sanity check in a similar way to the _check_sn_uniqueness
function, not just checking for removed stock move lines, but also unremoved
stock move lines. A test case is also added to check this scenario.

This is a similar fix to a previous commit we did
(4f07b260807053586ac6c01cf92ac3d5e37b1041) where we bumped into a
problem with the duplicate serial sanity check.

closes odoo/odoo#142574

X-original-commit: 1761b95d9fda5d5355f35effd1f345a25ded1197
Signed-off-by: William Henrotin (whe) <whe@odoo.com>

addons/mrp/models/mrp_production.py

@@ -2560,10 +2560,17 @@ class MrpProduction(models.Model):
             removed = self.env['stock.move.line'].search_count([
                 ('lot_id', '=', lot.id),
                 ('state', '=', 'done'),
-                ('location_dest_id.scrap_location', '=', True)
+                ('location_id.scrap_location', '=', False),
+                ('location_dest_id.scrap_location', '=', True),
+            ])
+            unremoved = self.env['stock.move.line'].search_count([
+                ('lot_id', '=', lot.id),
+                ('state', '=', 'done'),
+                ('location_id.scrap_location', '=', True),
+                ('location_dest_id.scrap_location', '=', False),
             ])
             # Either removed or unbuild
-            if not ((duplicates_unbuild or removed) and duplicates - duplicates_unbuild - removed == 0):
+            if not ((duplicates_unbuild or removed) and duplicates - duplicates_unbuild - removed + unremoved == 0):
                 return True
         # Check presence of same sn in current production
         duplicates = co_prod_move_lines.filtered(lambda ml: ml.quantity and ml.lot_id == lot)

addons/mrp/tests/test_order.py

@@ -1391,6 +1391,79 @@ class TestMrpOrder(TestMrpCommon):
         subassembly_mo2.lot_producing_id = subassembly_sn
         subassembly_mo2.button_mark_done()
 
+    def test_product_produce_duplicate_6(self):
+        """Produce a product for the second time with the same serial
+        after having unbuilt, scrapped and unscrapped the product"""
+        product = self.env["product.product"].create(
+            {
+                "name": "Product",
+                "type": "product",
+                "tracking": "serial",
+            }
+        )
+
+        sn = self.env["stock.lot"].create(
+            {
+                "name": "SN",
+                "product_id": product.id,
+                "company_id": self.env.company.id,
+            }
+        )
+
+        mo1_form = Form(self.env["mrp.production"])
+        mo1_form.product_id = product
+        mo1 = mo1_form.save()
+        mo1.action_confirm()
+        with Form(mo1) as mo:
+            mo.qty_producing = 1
+        mo1.lot_producing_id = sn
+        mo1.button_mark_done()
+
+        ub_form = Form(self.env["mrp.unbuild"])
+        ub_form.mo_id = mo1
+        ub = ub_form.save()
+        ub.action_unbuild()
+
+        scrap = self.env['stock.scrap'].create({
+            'product_id': product.id,
+            'product_uom_id': product.uom_id.id,
+            'lot_id': sn.id,
+        })
+        scrap.do_scrap()
+
+        unscrap_picking = self.env['stock.picking'].create({
+            'picking_type_id': self.env.ref('stock.picking_type_internal').id,
+            'location_id': scrap.scrap_location_id.id,
+            'location_dest_id': scrap.location_id.id,
+        })
+        unscrap_move = self.env['stock.move'].create({
+            'name': 'unscrap',
+            'location_id': scrap.scrap_location_id.id,
+            'location_dest_id': scrap.location_id.id,
+            'product_id': product.id,
+            'product_uom': product.uom_id.id,
+            'picking_id': unscrap_picking.id,
+        })
+        unscrap_picking.action_confirm()
+        self.env['stock.move.line'].create({
+            'move_id': unscrap_move.id,
+            'product_id': unscrap_move.product_id.id,
+            'lot_id': sn.id,
+            'quantity': 1,
+            'product_uom_id': unscrap_move.product_uom.id,
+            'picking_id': unscrap_move.picking_id.id,
+        })
+        unscrap_picking.button_validate()
+
+        mo2_form = Form(self.env["mrp.production"])
+        mo2_form.product_id = product
+        mo2 = mo2_form.save()
+        mo2.action_confirm()
+        with Form(mo2) as mo:
+            mo.qty_producing = 1
+        mo2.lot_producing_id = sn
+        mo2.button_mark_done()
+
     def test_product_produce_12(self):
         """ Checks that, the production is robust against deletion of finished move."""