[FIX] mrp: fix workcenter capacity

Planning the workorders depends on the quantity to produce of those workorder
This will create as much as production batch needed regarding the workcenter
capacity.

This method is good except in case of product tracked by serial number. In that
case the quantity to produce on the workorders is force to 1 regardless of
the quantity to produce on the production

closes odoo/odoo#40226

X-original-commit: 3c4133ddac256c63802a99461db49cc9bd9fa1d6
Signed-off-by: William Henrotin <Whenrow@users.noreply.github.com>

addons/mrp/models/mrp_production.py

@@ -703,6 +703,8 @@ class MrpProduction(models.Model):
         self.ensure_one()
 
         # Schedule all work orders (new ones and those already created)
+        qty_to_produce = max(self.product_qty - self.qty_produced, 0)
+        qty_to_produce = self.product_uom_id._compute_quantity(qty_to_produce, self.product_id.uom_id)
         start_date = self._get_start_date()
         for workorder in self.workorder_ids:
             workcenters = workorder.workcenter_id | workorder.workcenter_id.alternative_workcenter_ids
@@ -712,7 +714,7 @@ class MrpProduction(models.Model):
             for workcenter in workcenters:
                 # compute theoretical duration
                 time_cycle = workorder.operation_id.time_cycle
-                cycle_number = float_round(workorder.qty_producing / workcenter.capacity, precision_digits=0, rounding_method='UP')
+                cycle_number = float_round(qty_to_produce / workcenter.capacity, precision_digits=0, rounding_method='UP')
                 duration_expected = workcenter.time_start + workcenter.time_stop + cycle_number * time_cycle * 100.0 / workcenter.time_efficiency
 
                 # get first free slot
@@ -740,7 +742,7 @@ class MrpProduction(models.Model):
 
             # Instantiate start_date for the next workorder planning
             if workorder.next_work_order_id:
-                if workorder.operation_id.batch == 'no' or workorder.operation_id.batch_size >= workorder.qty_producing:
+                if workorder.operation_id.batch == 'no' or workorder.operation_id.batch_size >= qty_to_produce:
                     start_date = best_finished_date
                 else:
                     cycle_number = float_round(workorder.operation_id.batch_size / best_workcenter.capacity, precision_digits=0, rounding_method='UP')

addons/mrp/tests/test_workorder_operation.py

@@ -1263,6 +1263,26 @@ class TestWorkOrderProcess(TestWorkOrderProcessCommon):
         self.assertAlmostEqual(wo.date_planned_start, datetime.now(), delta=timedelta(seconds=10))
         self.assertAlmostEqual(wo.date_planned_finished, datetime.now(), delta=timedelta(seconds=10))
 
+    def test_planning_7(self):
+        """ set the workcenter capacity to 10. Produce a dozen of product tracked by
+        SN. The production should be done in two batches"""
+        self.workcenter_1.capacity = 10
+        self.workcenter_1.time_efficiency = 100
+        self.workcenter_1.time_start = 0
+        self.workcenter_1.time_stop = 0
+        self.routing_1.operation_ids.time_cycle = 60
+        self.product_4.tracking = 'serial'
+        mo_form = Form(self.env['mrp.production'])
+        mo_form.product_id = self.product_4
+        mo_form.bom_id = self.planning_bom
+        mo_form.product_uom_id = self.uom_dozen
+        mo_form.product_qty = 1
+        mo = mo_form.save()
+        mo.action_confirm()
+        mo.button_plan()
+        wo = mo.workorder_ids
+        self.assertEqual(wo.duration_expected, 120)
+
     def test_plan_unplan_date(self):
         """ Testing planning a workorder then cancel it and then plan it again.
         The planned date must be the same the first time and the second time the