Create CAA record

Is there any possibility to create a CAA record in UCS DNS (Bind with samba4 backend). I need to to get Labca (Letsencrypt CA for private network certificate distribution) working.


I came up with the idea of using nsupdate:

adding a A record with nsupdate is no problem, adding CAA ist not working (Update failed: SERVFAIL)

This is the command used: update add mydomain.local 86400 CAA 0 issue “mydomain.local”

Any hints?