If you change your course of study (and therefore have a new course code) or changed provider, you must fill out a new electronic Commonwealth Assistance Form (eCAF) and supply your Tax File Number by the census date. 

An application made for one course does not apply to any other course you may undertake, including Honours. If you change your course of study or change provider and do not complete a new Request for Commonwealth Support and HELP form/s before the relevant census date your enrolment will be cancelled.

This applies to HECS-HELP, FEE-HELP, and SA-HELP.