GetBulk on an SNMP Custom Sensor

Is there anyway to do a GetBulk for a specific OID on a sensor?

For example: I've been trying to do this with ospfNbrState (1.3.6.1.2.1.14.10.1.6). Using this OID doesn't work (SNMP Error #223). However, if I'm more specific and create an SNMP custom sensor pointing at a specific neighbor (1.3.6.1.2.1.14.10.1.6.192.168.0.18.0) then it works, I just don't want to do this for every single individual neighbor.

Thanks

prtg sensor snmp