If you can not provide enough evidence supporting your experience, then, yes, DIAC can override.Hi
ACS recently assessed me 5 year experience
Can DIAC override that experience
Most, if not all, of this is required for ACS, so unless you have lied and ACS didn't pick this up then you should be ok then.If you can not provide enough evidence supporting your experience, then, yes, DIAC can override.
But as long as your experience claim is genuine and you have evidence to substantiate your experience claim (like bank statement, payslip, offer letter, appointment letter, reference letter in company letterhead, etc.), then nothing to worry about.