I started QuickBooks in Dec 2019! I am trying to enter the business GST for Jul - Oct 2019! QuickBooks won't let put data in! o Have Nov Dec Bas completed!

Hi alexskylights, 

The system for recording and lodging BAS in QuickBooks Online is designed to only work with consecutive BAS periods, so once a period has been marked as lodged, it will not allow you to enter a previous BAS in the system. If you are looking to record those previous BAS periods in QuickBooks, you will need to unlodge any periods that have already been recorded so that you can begin filing from the earlier quarter. If you have an Accountant or ProAdvisor invited to your company they will be able to unlodge this period for you, or alternatively you can contact our support representatives by phoning 1800 046 038 so that we can unlodge it on your behalf. If you would rather get a call-back from a representative or talk to us via Messaging, follow the steps below:

1. Sign in to your QuickBooks Online company.
2. Select Help (?) at the top right.
3. From the Search tab, enter Contact Us.
4. Select the Contact Us button.
5. Choose Callback.

For the support availability time, visit this article to know more: Get help with QuickBooks products and services. 

-Lucas