Back to theory:

- VAT- registered business that trade in goods with other EU member states are required to provide details of these transactions, which are used for statistical purposes. “Intrastat” is the system used to collect these statistics. Services are excluded from Intrastat.

- What a company has to declare depends on thresholds. Each EU country is free to define its own thresholds for both Arrivals and Dispatches. Thresholds exist to define the requirement for Intrastat reporting and, in certain EU member states, for allowing simplified Intrastat Declaration. See: https://www.avalara.com/vatlive/en/eu-vat-rules/eu-vat-returns/intrastat-reporting-thresholds.html

How to deal with Intrastat in Odoo?

1) Activate the Intrastat feature in the Settings

2) Define Default Incoterm (and for Belgian accounting, you can also define the Company Intrastat Region. /!\ If you have multiple warehouses, you can configure the Intrastat Region on each warehouse independently)

3) Configure your products (mandatory to use one to impact the Intrastat report)

- Define the commodity code

- Define the country of origin

4) Create a customer invoice/ vendor bill

- Use a product (MANDATORY)

- In  "Other Info" tab, define: 

        - Incoterm: if no default incoterm defined above or if different

         - Intrastat country: by default = country_id of the partner_id

         - Intrastat transport mode

5) Accounting -->Reporting --> Intrastat Report