Use today as planned date for assigned move in stock moves by warehouse

Closes #13417
(grafted from bc28a787ed0da0f87c769cde7a8920da01ba2cc7)

--HG--
branch : 6.0

modules/stock/product.py

@@ -8,7 +8,7 @@ from copy import deepcopy
 
 from simpleeval import simple_eval
 
-from sql import Literal, Select, Window, With
+from sql import Literal, Null, Select, Window, With
 from sql.aggregate import Max, Sum
 from sql.conditionals import Coalesce, Case
 from sql.functions import CurrentTimestamp
@@ -825,7 +825,10 @@ class ProductQuantitiesByWarehouseMove(ModelSQL, ModelView):
         warehouse = With('id', query=Location.search([
                     ('parent', 'child_of', [location_id]),
                     ], query=True, order=[]))
-        date_column = Coalesce(move.effective_date, move.planned_date)
+        date_column = Coalesce(
+            move.effective_date,
+            Case((move.state == 'assigned', today), else_=Null),
+            move.planned_date)
         quantity = Case(
             (move.to_location.in_(warehouse.select(warehouse.id)),
                 move.internal_quantity),