Problem with anomaly logs

Hi everyone, i started to work with a firewall 1500dt some weeks ago and i can't solve my problem yet. I want to take every logs from the firewall, specially attack logs (anomaly logs). The problem is when i use CLI commands in the firewall to see the logs, traffic or event logs are displayed but anomaly report not (i'm sure there are, but i don't know why these are not displayed). I'm writting next commands:

XXXX # execute log filter list -> to show wich category i want to display, in this case i want 7 (anomaly logs) XXXX # execute log filter category 7 XXXX # execute log display

And i got this: 0 logs found. 0 logs returned.

I tried to configure manually the anomaly logs: XXXX # config log eventfilter, but there is not an anomaly option in this case, only in syslog device appear, but i don't want to export logs to a server. Some idea about why anomaly logs are not displayed? Thank you for the help, Regards.