The  Tax Practitioners Board chair released the ability to register in these first 3 years (up until February 2013) if you have been preparing BAS's to a competent standard for a reasonable period has led to the following:

• Reasonable period is considered to be at least 700 hours in the last two years. Anything less would need to be considered on a case by case basis.  
• Competent standard should be demonstrated via a certificate or reference from the applicant's employer or from the tax agent of the clients for whom the work is done. If the applicant is unable to obtain a certificate/reference from the employer or relevant tax agent, the Board would need to consider the application on a case by case basis

You can read the Tax Practitioners Board chairs full release - click here.