It was added (at the end of the list) in firmware version 14.12 with the name "UPET" and renamed to "CPE" since V15.04.1 (i think...).
But there's also a limit of 16 entries, nothing will change if the limit is already reached.
Got my "problem". Cura said "no update available", but this was a problem in the Cura-Version. Got a new version and a new firmware now. Thanks.