When trying to roll over an error appears saying you have not finalised your BAS returns (even when you have), it may be because you have not included PAYG in your finalised returns. 

NOTE: This solution is only for companies that do NOT use payroll and hence do not need to report PAYG amounts in BAS.

If you do not use PAYG, in your BAS tab go to Setup > PAYG Withholding > Change the frequency to NONE and the 'Update BAS Total from' to Manual Entry/Not Used.

You should then be able to roll over successfully.