erp5_simulation: keep one sm in order to be able to generate divergence

bt5/erp5_simulation/DocumentTemplateItem/portal_components/document.erp5.QuantityDeliverySolver.py

@@ -85,8 +85,11 @@ class QuantityDeliverySolver(XMLObject):
       for movement in simulation_movement_list:
         movement.edit(delivery_ratio=movement.getQuantity() / new_quantity, activate_kw=activate_kw)
     else:
+      # zero quantity
+      movement = simulation_movement_list.pop()
+      movement.edit(delivery_ratio=1, quantity=0, activate_kw=activate_kw)
       for movement in simulation_movement_list:
-        movement.edit(delivery_ratio=0, activate_kw=activate_kw)
+        movement.edit(delivery_ratio=0, quantity=0, activate_kw=activate_kw)
 
     return result