Here you set withholdings and cases linked to domestic exemptions (former VAT Code Article 22 / new Article 27).
When the document has a tax withholding and/or lines without VAT due to a domestic exemption.
Open Settings → Tax connections → Variable mapping and fill the yellow myDATA fields on the related document / VAT. The basics are in the main myDATA mapping article.
On-screen steps
What the codes mean
Withholdings use a withheld-tax category (myDATA appendix §8.4). For a domestic exemption (former Art. 22) the exemption reason is usually code 7 (new Art. 27). Follow the screenshots for the exact EMDI combinations.