Can Time Machine back up to a Western Digital "My Passport Wireless" over wifi?

I bought a Western Digital "My Passport Wireless" external hard drive / NAS to use as a Time Machine backup for my new MacBook Pro.  I plugged it in via USB, formatted it to HFS+, and ran Time Machine.  All good.
This hard drive has a wireless chip in it, so one can connect to it via wifi, either directly or through a router.  When I dismounted the drive and connected via wifi (via my router), my expectation was that I could run Time Machine and do periodic back-ups without having to remember to plug in the drive, etc. 
I can see the drive and read/write to it.  I am connected as 'admin', not 'guest'.  It is named "MyPassport", both when connected via USB and via wifi.  When I try to use the drive via wifi for Time Machine, I'm asked:  "Do you want to stop backing up to “MyPassport” and use “TimeMachineBackup/TimeMachine” instead, or back up to both?"  When I select "Use both", I'm then told:  "Time Machine can’t access the backup disk “TimeMachineBackup/TimeMachine”.  The operation couldn’t be completed. (OSStatus error 2.)"
Should it be possible for Time Machine to recognize the same archive, whether connected via USB or wifi? 
If I cannot, can I at least back up a new archive over wifi.  I recognize that the first go at this would take a long time due to slow wireless transfer speed.  What does OSStatus error 2 mean? 

So you think that you know better than Apple.
NAS is not supported by Time Machine, you can take all the risks you like but do not advise others to do so. It doesn't matter what WD say, they want you to buy one, Apple are the deciders of what is supported or not.
Here's what WD say:
Note: WD does not provide technical support for Time Machine related issues. For assistance with backing up to a WD NAS drive, using the Time Machine application please contact Apple. As the backup application is built into the OS, they are the only ones qualified to diagnose a Time Machine related issue.
Good luck.

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