Enabling and Entering Customer Numbers
You can enable the use of customer numbers by following these steps:
How to Enable Customer Number Management
Go to the Settings menu
Search with the keyword customer number
Enable Customer Number Management
How to Enter a Customer Number
Go to the customer’s information page
Open the Additional Information tab
Enter the customer number in the designated field
The customer number currently appears only on the Customers page. If desired, you can display it by adding it to the table columns via the Columns button.
The customer number can also be used for factoring invoicing, but it will not appear on the invoice itself.