Your customer has, in addition to his local VAT number, a foreign VAT number and you need therefore to send a VAT return for this other country.
How to do it in Odoo?
- In Configuration - Fiscal Positions, create a new position
- In this new tax position, fill in the Foreign Tax ID (VAT number) and the Country
- Click on the blue banner to install the localization module
- Select the corresponding localization module and install it
- Return to the Fiscal Position just created and click on the blue banner to create the taxes for this new position
- Then create the tax mapping.
- From now on, when you use this fiscal position, the tax will be automatically adapted and you will be able to generate a tax report in the relevant localization.