QuickBooks customers, vendors, and employees exist in the same database table. When you look at vendors, you're looking at a filtered list of records where the customer type is vendor. Customers can have a type of other. Our system cannot locate customers if their type is other.
You must change the customer type. Here are the steps:
In QuickBooks' top menu, click lists > other names list.
Locate the customer record.
Double click the row.
Click the change type button:
When promoted that the change cannot be undone, click OK.
Vendor / Employee
You cannot have a customer who is an employee and a vendor. This happens when you buy something from a customer who bought something from you. To check if you have a vendor with the same name, follow these steps:
In QB, go to vendor > vendor center.
From the drop down, choose all vendors.
Search for a vendor.
If you find a match, rename the vendor:
For employees the steps are the same. This error happens when you place test orders using an employee of your company.