W-INV237
ID must be unique within the document instance
warning: reported, still valid
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.
Context
doc:Invoice/cac:InvoiceLine
Test
cbc:ID = ./following-sibling::*/cbc:ID
Checked with Denmark OIOUBL 2.1 Invoice