BR-65: The Item classification identifier (BT-158) shall have a Scheme identifier

In UBL, the rule applies to cac:InvoiceLine/cac:Item/cac:CommodityClassification/cbc:ItemClassificationCode and cac:CreditNoteLine/cac:Item/cac:CommodityClassification/cbc:ItemClassificationCode, and requires the @listID attribute to exist. The UBL test only checks exists(@listID), so it requires the attribute to be present, even if empty. In CII, the rule applies to //ram:DesignatedProductClassification and passes if ram:ClassCode is absent, or if ram:ClassCode has a @listID with non-whitespace content. If ram:ClassCode is present but its @listID is missing or empty/whitespace, the rule fails.

For UBL, add a listID attribute to the cbc:ItemClassificationCode element and set it to a value identifying the classification scheme; the rule does not define the allowed values, so consult the relevant code list or specification. For CII, if you include ram:ClassCode inside ram:DesignatedProductClassification, set its listID attribute to a non-empty scheme identifier; alternatively, if no classification code is required, the element may be omitted.