At the end of last year we introduced a rule so that once you’ve submitted a W form for US tax purposes, and you want to update your Billing Details, then you need to submit a new W form. This has stopped some of you from updating your VAT or Company Numbers since our change.
We’ve fixed this issue today. Now, even if you’ve submitted a W form, you can update your VAT Number from the Checkout or Personal Information contexts and your Company Number from the Personal Information context.
Thanks and sorry for any inconvenience here.