Hi Nikolay,
my initial question is still unanswered.
Well I found note 2130044 which says that Transactions SRTM, SAAB, and SQLM use Runtime Monitor tests - executed byRTM_PERIODIC_JOB.
Yes I am a frequent user of SAAB, probably always the first user at a client. So that must have been transaction SAAB that scheduled the Job without asking or evebn telling me.
SCN did not help, google did not help.
Regards, Clemens