Hi there, Ringwaldt.

I appreciate the detailed information you've provided about PAYG withholding on this quarter's BAS. Let me share some insights about the error message you're getting. This is due to the accounting settings that are not matching to what you have on the ATO portal. 

You'll want to check your GST Settings in QuickBooks as well as the settings in ATO. This is to ensure correct accounting method is used.

In the meantime, you can lodge the BAS outside QuickBooks to avoid incurring late fees. You may then mark as lodged to QBO.

Please let me know if you need more help. I'll be right here to help.