KAO2411,
It's vital that all your transactions are correctly entered so that your books can be well balanced. QuickBooks Desktop is a great tool able to help you create purchase orders so that you can send them to your suppliers to order products or services from them. I can point you in the right direction for assistance with duplicate entries.
For assistance with transactions being duplicated, I recommend reaching out to the QuickBooks Desktop support team. They'll be able to view the transaction in your account as well as your settings in order to assist you in preventing these duplicate entries. You can reach out to them using the methods outlined in the QuickBooks Desktop software support policies.
If you have any other questions, feel free to reach out here,
