Cisco VTP Status Reports

I think that I found a possible solution for this. OID 1.3.6.1.4.1.9.9.46.1.8.1.1.3 is "vtpDatabaseLocalMode(3)". The description for this OID is as follows:

The local VTP mode for a particular database type
 in this administrative domain.
 
 - 'client' indicates that the local system is acting
 as a VTP client of the database type.
 
 - 'server' indicates that the local system is acting
 as a VTP server of the database type.
 
 - 'transparent' indicates that the local system does
 not generate or listen to VTP messages of this
 database type , but forwards
 messages. This mode can also be set by the device
 itself when the size of database is too large for it
 to hold in DRAM.
 
 - 'off' indicates that the local system does not
 generate , listen to or forward any VTP messages
 of this database type.
 
 The default mode is 'client' for the database type
 known to the local device and 'transparent' for the
 unknown database type.

This is exactly what I am looking for, but when I try to "Test" it against my core switch, I get a "The OID is not supported" message. Any chance that this can be added to the MIB database?