Thanks for posting back here, @Alfredo_R.

My colleague is right. You need first to record the payment by creating a check. In QuickBooks Desktop, you use regular checks to pay for a fixed asset, inventory and non-inventory part, service, other charges, and any expense you track. 

After creating the check, enter the bill once you receive the items. You may also check this article for the detailed process: Enter bills in QuickBooks Desktop.

Lastly, after you record what you owe your vendors, you can go to the Pay Bills window to settle your payables. If you received a discount or credit from a vendor, you apply it to your bill payment to reduce your total payable.

You can also directly pay your vendor bills in QuickBooks. It also records your payment automatically so your reports are accurate.

Don't hesitate to leave a comment down below if you have other concerns. I'll be more than happy to help you. Have a pleasant day.