Background job type 'cancelling'

Hi mates,

I'm on a PI 7.31 dual stack and I'm trying to create a background job in order two cancel the unfinished messages, according to the info found at Help Portal: http://help.sap.com/saphelp_nw73ehp1/helpdata/en/b8/ca9b0c2e2c46579126fcf2d913968f/content.htm

Nevertheless, when I try to create a new job of type 'Cancelling' in the Background Job Processing Monitor (NWA) I can't find the option 'Job Type: Cancel' (just Delete, Archive, Restart and Recover).

Does anyone konw how to achieve the cancelling of unfinished messages in AAE?

Thanks in advance,

Francisco