@EmanE17 

"If you don't have credit with the vendor in the first place, you can simply delete the journal entry made by your accountant, especially if it was created by mistake. If that's the case, I’ll guide you through the process of how to delete the journal entry."

Yikes! Did you happen to read your customer's post? Your reply is obviously just a guess. The journal entry is from 2014. It cannot be deleted because it's from a closed period, and deleting it will affect their balance sheet every year for the last 10 years.