There is a question in relation to your occupation in the online application form. There is a drop down list, and you're provided with a plethora of choices to pick from, you need one that most closely describes the occupation/profession/trade you're involved in (as of the date of your application).
As far as I understand, there is no requirement to work in the same SOL occupation that was assessed and claimed as a basis for PR visa, nor there is any penalty for being unemployed, self-employed, etc.
This is merely my personal understanding of the matter,, please correct me if I'm wrong.
Wishing everyone a speedy processing!