BR-54Each Item attribute (BG-32) shall contain an Item attribute name (BT-160) and an Item attribute value (BT-161).

Why does BR-54 happen?

Attributes are taken from a property table in which values are allowed to be absent. The group is produced per property even where only the name is populated.

What the validator checks

The expression the official KoSIT rule set evaluates — not paraphrased, but read from the Schematron file it ships. UBL and CII address different document trees, so the same rule reads differently in each.

UBL

exists(cbc:Name) and exists(cbc:Value)

CII

(ram:Description) and (ram:Value)

Source: rule set v2026-08-31

How do you fix BR-54?

Write cac:Item/cac:AdditionalItemProperty only where both fields are populated — cbc:Name and cbc:Value in UBL, ram:ApplicableProductCharacteristic with ram:Description and ram:Value in CII. Watch out in CII: the name lives in ram:Description, not in any ram:Name — look for the obvious element and you will not find it.

<cac:Item>
  <cbc:Name>Beratungsleistung</cbc:Name>
  <cac:AdditionalItemProperty>
    <cbc:Name>Projektnummer</cbc:Name>
  </cac:AdditionalItemProperty>
</cac:Item>

<cac:Item>
  <cbc:Name>Beratungsleistung</cbc:Name>
  <cac:AdditionalItemProperty>
    <cbc:Name>Projektnummer</cbc:Name>
    <cbc:Value>P-2026-0815</cbc:Value>
  </cac:AdditionalItemProperty>
</cac:Item>