Hello there,

Thanks for getting back to us. We're unable to track GST on Accounts Payable and Accounts Receivable account in QBO. The system will only allow you to track taxes on the expense, checking, and income accounts. 

To categorise the transaction set the GST to Out of Scope or if you wanted to apply tax on the transaction use a different account like use the same account used on the original transaction.

Stay in touch with me on how the contact goes by commenting below. I'm always right here whenever you have follow-up questions.