Added method "isDeletable" to interface

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@30651 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/interfaces/simulation_movement.py

@@ -87,4 +87,10 @@ class ISimulationMovement(IMovement, IPropertyRecordable, IDivergenceController,
     into account the errors of the simulation fixed by
     the delivery:
       quantity + delivery_error
+    """
+
+  def isDeletable():
+    """
+    Returns True is this simumlation can be deleted, False
+    else.
     """
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