Ok, everyone I know (to my knowledge) were not on State Provisional visas. The website says "Provisional visa holders must live and work in a “regional” area (as classified by DIBP) of Australia. The whole of South Australia is classed as “regional”, including Adelaide for the purposes of state nominated General Skilled Migration (GSM)."
That would suggest that you have to remain in SA. I would check with a decent agent as they will tell you. Remember, DIAC or whatever they are now called will not be held to anything they tell you.