Hi lmb1707
We have been receiving a few reports from other users with this issue. If you use payroll categories, the cause most likely is any General Journal without a tax code in the first line. Please try the following and let me know how you go:
1) Run GST Detail report and check if that is getting displayed without any issues.
2) If you get any error messages while running the report for selected date range, narrow down the date that the transaction actually is in by selecting smaller date ranges on the GST Detail Report until you narrow it down to one day. Find the General Journal and enter in missing tax code if general journal is within file current financial year.
3) Run the report again and if it displays fine, try to lodge BAS.
If the above mentioned workaround does not work for you, please send us your serial number by a Private Message as further investigation is being done on this issue.