Spouse's Work Entitlement on Visa 573

Hi,

I am an Indian citizen.
I am going to Australia to pursue MBA (Master by coursework) and have been granted visa 573. My spouse who may be accompanying me has also been granted the spouse/student visa (subclass 573).

With regards to my spouse's work entitlement, I understand the following condition holds:

Dependent family members with Permission to WorkYou can work a maximum of 20 hours per week throughout the year. A week begins on a Monday and ends the following Sunday.
Exceptions: Family members of students can work unlimited hours when the student starts their main course:

students enrolled in Masters by coursework (visa 573)
students enrolled in Masters by research or Doctoral degree (visa 574)
students studying a Masters by coursework, Masters by research or Doctoral degree, sponsored by AusAID or Defence (visa 576).
You cannot undertake work until the primary student visa holder has started their course in Australia.

quoted from (http://www.immi.gov.au/students/student ... -works.htm)

This clearly means that my spouse is entitled to work unlimited hours.

However, on my spouse's visa I see the following condition:

"8104 WORK LIMITATION"

Can you please let me know what is this suppossed to mean?

Thank you for your assistance.

Regards