excluding auditd events

[Mr Dash Four]

I am having difficulty in trying to exclude a certain type of messages 
for certain SELinux types being reported to the auditd daemon.

In particular, I would like to exclude the following from being reported 
(and thus filling up my audit logs unnecessarily):

msgtype={USER_ACCT|CRED_ACQ|USER_START|CRED_DISP|USER_END}
obj_type=crond_t
success=0

When I try to add this as a rule with "auditctl -A exclude,never -F 
msgtype=USER_ACCT -F obj_type=crond_t -F success=0" I get "Only msgtype 
field can be used with exclude filter" which is a bit daft as I wish to 
exclude USER_ACCT message type from being reported *only* for the 
"crond_t" SELinux type. Is there any way I can do this?