DT-CIUS-PT-131
The BT-151 does not meet the defined format: only admits the following values: AA, S, E, RED, INT, NOR, ISE, OUT, NA, Z, AE, IC, G, O.
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.
//ubl:Invoice/cac:InvoiceLine/cac:Item/cac:ClassifiedTaxCategory/cbc:ID | //cn:CreditNote/cac:CreditNoteLine/cac:Item/cac:ClassifiedTaxCategory/cbc:ID
(not(contains(normalize-space(.),' ')) and contains(' AA S E RED INT NOR ISE OUT NA Z AE IC G O ',concat(' ',normalize-space(.),' ')))
Checked with Portugal CIUS-PT Invoice (UBL), Portugal CIUS-PT Credit Note (UBL)