What is a common workflow error that can cause duplicate expenses in QuickBooks Online?

A common workflow error that can cause duplicate expenses in QuickBooks Online is:

Duplicating any transaction.

Explanation:

The reason behind this is that duplicating transactions is very common because it might originate before the accounting process is made. It can be executed by any manager or someone in the resources acquisitions department. That is why the books have to be reviewed at two different moments from two different departments. Accounting first and then finance. To check that everything is correct.