What are the consequences of deleting an invoice in QBO?

Hello ernesto-correa-m.

Welcome back to the Community. I'm happy to learn you're taking advantage of the powerful features offered in QuickBooks. I'll be happy to share more information about deleting invoices. 

Deleting an invoice means that you'll be permanently removing it from your file. If there are any transactions linked to the invoice, QuickBooks will alert you with this pop-up message "This transaction is linked to others. Are you sure you want to delete it?" This saves you from deleting vital invoices that are linked to other transactions. I encourage you to learn more about deleting transactions using this link here. 

In case you have other questions, feel free to reach back to me in the comments. My goal is to help make sure you achieve your QuickBooks goals.