erp5_simulation: set also reference on split movement

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

@@ -131,6 +131,9 @@ class QuantitySplitSolver(SolverMixin, ConfigurableMixin, XMLObject):
         if stop_date is not None:
           new_movement.recordProperty('stop_date')
           new_movement.setStopDate(stop_date)
+        reference = configuration_dict.get('reference', None)
+        if reference is not None:
+          new_movement.setReference(reference)
         if activate_kw:
           new_movement.setDefaultActivateParameterDict({})
         simulation_movement.expand(activate_kw=activate_kw)