Time machine on local WiFi network - OS Extended (Journaled) format error

Hi guys,
I did an initial Time machine backup of my Macbook Pro via Firewire to an external hard disk. Everything went smoothly and later Time Machine did regular backups without any problem.
When I attached the external Time Machine hard disk to one of the Macs in my local WiFi network the troubles began.
My Macbook could still see and mount the Time Machine drive via the network but didn't want to backup to this drive any longer. It came up with this error message: "The backup volume is not in Mac OS Extended (Journaled) format, which is required..."
When I connected the Time Machine drive back to my Macbook directly via Firewire, it resumed its backup duties without complaining. Very strange...
Whenever Time Machine tries to excess the drive via the network (AFP shared) I get the format error message. Attached directly to the Firewire port it works flawlessly. Any suggestions how to solve the problem?
I really want to do my backups via the wireless network and without having to plug-in the drive directly into my Macbook, which wouldn't be a very mobile solution for a laptop
Would an Airport Extreme station with an attached USB drive behave differently?

read this:
http://www.appleinsider.com/articles/08/04/02/exploringtime_capsule_time_machine_over_the_network_vsusb.html

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HT4906 The backup disk is not in Mac OS Extended (Journaled) format, which is required.

Time Machine error!
The backup disk is not in Mac OS Extended (Journaled) format, which is required.
And what's Time Capsule?

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OT

Time machine on local WiFi network - OS Extended (Journaled) format error

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