Actual customers include only those defined under the Customers tab. They can be edited there. But your title suggests you are referring not to customers, but Payers. These cannot be edited, because they are simply previous entries. But the auto-suggestion list is only 5 options long. So after a few more Payers are entered, odds are the nuisance entry will no longer appear.
Thanks. This seems to be an unannounced improvement. Older versions used to offer up entries that had been made, even if they’d later been changed. This might have happened when the transactions tabs were combined. Hopefully, it’s also related to the promised ability to eventually link cash sales and purchases to customer and supplier accounts, statements, etc.
I notice your reference is older than the tab combination, so that can’t be when it happened. But it’s still fairly recent. There are other threads that suggest it used to be different, but none are specific enough to really answer the question:
In this one (and the responses that follow), several regular forum contributors are trying to guess how the program works: