Add vat number to customer

Open backoffice.

Click modules => Retail and commerce => Customers

Search the customer.

Click on name. A popup will appear. In the popup, enter the name of the customer.

When you have found the customer, select the bullet in front of the name.

Scroll to the top of the page, click 'Registration ID's

Click 'Add'

In the first column select 'VAT id', in the second column fill in the VAT number.

Scroll to the top of the page, on the left side click 'Save'.