Hi userilona-abram,
Thanks for reaching out to us with this one, I'll try my best to help you troubleshoot.
There could be a number of reasons why you cannot mark a BAS as lodged in QuickBooks.
First off, have you connected your QuickBooks to the ATO via e-lodge?
Have the previous BAS's been lodged before the one you are trying to lodge now (remember they must be done in chronological order).
What is the error message you are getting? Could you please type it out word for word so as we can understand exactly what the situation is?
I'd love to help you fix this.
Kristian.
