Errors creating driver profiles for some HP drivers

[Jaapapa]

Hi,
we are installing the first production OES2 server in our otherwise Netware environment and are running into some issues with I-print.

In Imanager, when attempting to create a printer driver profile for some of our printer drivers I get either of the following error messages at the end of the creation wizard.

Error: Create Printer Driver Profile Failure
Print Manager name: PRINTMAN-01.PRINTERS.RESOURCES.EDIR
Request (SERVER_ERROR) - bad status code (0x500)
IPP Error: 0x500

--- OR ---

Error: Create Printer Driver Profile Failure
Print Manager name: PRINTMAN-01.PRINTERS.RESOURCES.EDIR
Request (CLIENT_ERROR) - bad status code (0x406)
IPP Error: 0x406

ndpsmmon.log displays the following error:

03/19/2008 12:04:01 PM, Operation Create Object:,
Error: 506D000C - object not found,
User Name, <admin account, removed from message>,
Address, <ip adress, removed from message>,
Object Name: unknown
(Client Interface)

Only when creating driver profiles for either the "HP Laserjet 4250 PCL6", "HP Laserjet 2100 PCL6" or "HP Laserjet 4050 PCL6" driver will the error display and the driver profile fail to create. Our other driverprofiles where created without problems (including several different HP PCL6 drivers).
Recreating and uploading drivers created using the iprint driver generator cooltool did not fix the problem. I tried several versions of the Iprint client, including 4.26, 4.32 and 4.34.

I'm using OES2 on SLES 10 SP1
iPrint Printmanager version 6.0.2007.0.9.12
iPrint Server version 6.0.2007.0.9.19

Imanager 2.7
iPrint Linux Management Plug-in 2.7.0.20070904

There is a patch available for this error for servers running version 5.1 ( http://download.novell.com/ ), but i cannot find such a patch for "iPrint Server version 6.0.2007.0.9.19".

Any ideas?