Hi Sadeta,
Thank you so much for your post and welcome to the Community Forum! Sorry to hear that you were not able to work on your BAS for this month.
In AccountRight software, you are able to work your BAS for three years (Last Year, This year and Next year) without rolling over your financial years. Can you please check in your system under Setup >> Company Information.
Secondly, if you are unable to prepare BAS for July period as you have all the three years open, then depending on the version of AccountRight you are using you can "Close a year" from the File menu and prepare your BAS. Once you have completed you can "Roll back a financial year" from the File menu and enter the adjustments as per your accountant's suggestion. To be able to do that you need to be the Administrator of the file.
Please do let me know how you go on this.
Regards,
Earl