XV-HR-01
Line …: '…' is not a six-digit KPD code such as 62.20.20; the Fiscalisation Act asks for the KPD code with at least six digits (NN 89/25, art. 42(2)).
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
cac:Item/cac:CommodityClassification/cbc:ItemClassificationCode[@listID = 'CG']
$code != ''
Checked with Croatia eRačun Invoice (UBL), Croatia eRačun Credit Note (UBL)