Hi there, @VIH.
If the travel expense is business-related, then yes, you can deduct it as an expense. However, if it's not, I'd recommend not to record it as a deduction.
I've got you these great resources for additional reference:
Then, in case you have a duplicated transactions in your QuickBooks Self-Employed (QBSE), here's an article you can read on how to handle the situation: Handle Duplicate Transactions in QuickBooks Self-Employed.
As always, keep me posted if you need further assistance. I'll be around to help.