l10n_nl_intrastat should be based on country of parent_id

[CasVissers-360ERP]

Hi,

Example: Company A has Customer B (Netherlands) with Invoice Contact C (Belgium)

In Odoo, fiscal postion and VAT are managed on customer B. The intrastat ICP module incorrectly calculates based on the country of the invoice contact (contact C).

I.e. auto fiscal position calculation on invoices also uses the customer, not the invoice contact.

Regards,
Cas