* Only for export (sale invoices). Import (Vendor bills) is not implemented
* Only for "Intrahandel". That is export within the EU
* Field Transport "Vervoerwijze" is set hardcoded on 3. This is the most common used value.
* Field Statistic stelsel "Statistisch Stelsel" is set hardcoded on 00. This is the most common used value.
* Field Transaction "Transactie" is set hardcoded on 1. This is the most common used value.
* Field "Bijzondere maatstaf" is not yet implemented.

See documentation added to this module (doc folder) for further information about the layout and field values.
