why is a SQL Query on _alert_hdl.._act_state not possible?

 A query like SELECT ALERT '_alert_hdl.._act_state' FROM '*.**' WHERE _DPT = "myDPType" is not possible because the alert_hdl.._act* attributes can not be used alone in Query Connects because they do not trigger a work function.

If there is also an attribute in the Select Statemant which can be used for connects, the query will be possible.

e.g this will work:

SELECT ALERT '_alert_hdl.._act_state', '_alert_hdl.._ack_time' FROM '*.**' WHERE _DPT = "myDPType"