May be attached e-invoice by reference to an external document instead of an embedded file?
Short answer
Yes. Standard EN 16931 within the support document group (BG-24) alongside the field BT-125 also offers field for embedded file BT-124 (External document location), which allows only a reference to its location outside of the invoice instead of inserting the document directly into the invoice XML, most often in the form of URL address.
External document location
Reference to document outside XML the invoice file.
Smaller Size XML
Suitable for large or frequently repeatedly used documents.
Long-term availability
The external message can stop working after a while.
File inserted for evidence
For long-term evidence is safer to use BT-125.
Conclusion
Annex e-invoice may be an external message via the field instead of an embedded file BT-124, for the long-term necessary evidence, a more secure file is inserted.
Sources
- EN 16931, field BT-124 (External document location) in group BG-24
- Law No. 222/2004 Z. z. o VAT, § 85o ods. 15 a § 71 ods. 3
Not legal advice. Machine-translated answer, not yet manually reviewed. For the exact wording, see the Slovak original.