code: def get_referenced_object(self):
          
  
          if self._MonetaryAccountBank is not None:
              return self._MonetaryAccountBank
  
          if self._MonetaryAccountJoint is not None:
              return self._MonetaryAccountJoint
  
          if self._MonetaryAccountLight is not None:
              return self._MonetaryAccountLight
  
          if self._MonetaryAccountSavings is not None:
              return self._MonetaryAccountSavings
  
          raise exception.BunqException(self._ERROR_NULL_FIELDS)
docs: :rtype: core.BunqModel
          :raise: BunqException