Error message when executing WITH statement in HANA on HCP

I tried to execute this statement:

WITH COOL AS (select 1 from dummy)

select * from COOL

on your factory account on HCP with SAP HANA  91 Version installed. It gives the followin error message:

13:59:57 (SQL Editor) Could not execute 'WITH COOL AS (select 1 from dummy) select * from COOL' Error:

(dberror) 585 - operation is not permitted

Any idea why?

Thanks Frank