Error: CMN.ATO.IITR.EM0043 – A tax return for this period has been lodged. An amendment is required to change or add information. More
A return has already been lodged. Check lodgments and submit an amendment to edit or add missing information.
Guidance:
Please check the ATO portal to see if there is lodged return for the same year.
If you want to make an amendment, you need to unlock the form (scroll through the bottom page of the form)
Then, press "Mark form as lodged".
Related article: How to "mark form as lodged"