From July 2022, External Reverse Charge (for Import/Export)
has to be sent through the SdI to the Agenzia delle entrate.
Exports will be 0% VAT
    (Reverse charged to the buyer)
Imports will have a -100%/+100% VAT tax
    (We are the buyers, and in charge of VAT)

See specification in the Task description.
Task: https://www.odoo.com/web#id=2823646&model=project.task



opw-2823646

closes odoo/odoo#94406

Related: odoo/enterprise#28798
Signed-off-by: Florian Gilbert (flg) <flg@odoo.com>