F-LIB171
Use either EmbeddedDocumentBinaryObject or ExternalReference
error: the document is invalid
What the rule checks
As the rule set's publisher wrote it. The rule runs on every element the context matches, and fails where the test is false; the validator reports the line of that element.
OIOUBL 2.1 Invoice rules (Denmark) 1.17.2
OIOUBL 2.1 Credit Note rules (Denmark) 1.17.2
OIOUBL 2.1 Reminder rules (Denmark) 1.17.2
Test
cac:Attachment/cbc:EmbeddedDocumentBinaryObject and cac:Attachment/cac:ExternalReference
Checked with Denmark OIOUBL 2.1 Invoice