**Behavior:**
Currently Intrastat reports are exported from the account.return view, and will be exported specifically in their extended mode and will contain both arrivals and dispatches. This causes issues for some users that want more specific formats like standard over extended, only arrivals/dispatches or both, etc... And this can cause them to not be able to submit their reports.

The solution is to currently reenable the user to export their report to XML from a cog menu in the Intrastat Report view. While still leaving the current flow through account.return possible, until a better solution is thought of.

**Steps to reproduce:**
- Connect to a company under Belgian Localisation.
- Create a product and, under the Accounting tab, specify a Commodity code (eg Live asses) and Country of Origin (Belgium)
- Create an Invoice containing the product to a Client in another EU Country (eg Luxembourg) and under the  'Other Info' tab, specify Intrastat Countrt (Belgium) - You can choose to leave out Intrastat Transport Mode and Incoterm, this will make the resulting XML have some  missing informations
- Create a Bill with the product with the same settings
- If you go to Intrastat Report, after changing the 'Report' filter to Intrastat (Goods) you will now be able to see an arrival and a dispatch. The extended mode filter is enabled by default, if you didnt fill Intrastat Transport Mode and Incoterm, you will see these missing.
- From this view there is currently no way to export the XML, to do that click the Returns button (select an Opening Date for accounting if needed), click on 'New' and specify Intrastat in the Return Type and a time window containing your Invoice and Bill.
- Then you will see an Intrastat Report show up and after selecting Review, then Submit, you will be able to download the XML. which will contain dispatches and arrivals and will be in Extended Mode. Which, if missing Transport/Incoterm, will fail when submitted to OneGate

opw-5347238

Forward-Port-Of: odoo/enterprise#102531