builder mixin: take into account supply start date even if it is defined on line

bt5/erp5_base/MixinTemplateItem/portal_components/mixin.erp5.BuilderMixin.py

@@ -431,6 +431,12 @@ class BuilderMixin(XMLObject, Amount, Predicate):
     for brain in previous_movement_list:
       brain.getObject().setQuantity(0)
 
+    # Calculate first possible shipment:
+    first_shipment_date = max(
+      supply.getStartDateRangeMin(),
+      supply.getParentValue().getStartDateRangeMin()
+    )
+
     # Prepare history list to work with
     history_list = resource_value.Resource_getInventoryHistoryList(
       from_date=from_date,
@@ -535,7 +541,7 @@ class BuilderMixin(XMLObject, Amount, Predicate):
       # XXX CLN This is very naive, it has to be optimized
       if start_date > supply.getStartDateRangeMax():
         break
-      if start_date < supply.getStartDateRangeMin():
+      if start_date < first_shipment_date:
         # As we are going to need to go further in time to check if new Movements are needed
         # we need to keep inventory correct
         #future_inventory_to_date += quantity