F-LIB075

Invalid schemeID. Must be either '…', '…', '…' or '…'.

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.

Test
cbc:ID/@schemeID = $TaxCategory1_schemeID or cbc:ID/@schemeID = $TaxCategory2_schemeID or cbc:ID/@schemeID = $TaxCategory3_schemeID or cbc:ID/@schemeID = $TaxCategory4_schemeID

Checked with Denmark OIOUBL 2.1 Invoice