def diff_ifc_asa(self, cli):
'Take care of the case where the field is empty, which means delete operation here'
if self.get_cli().strip() == self.asa_key and cli != self.asa_key and self.has_ifc_delta_cfg():
del self.delta_ifc_key
del self.delta_ifc_cfg_value
return CompositeType.diff_ifc_asa(self, cli)
