I'm trying to enter, in the VAT number of a non-EU supplier, the VAT number OO99999999999 as indicated in the Odoo documentation but when I try to save it gives me the warning mentioned below" and does not allow me to save the personal data.
Maybe I need to do something else to make it work properly?

The VAT number [OO99999999999] for partner [India Corporation LTD] does not seem to be valid. Note: the expected format is 12AAAAA1234AAZA