Message

Attribute 'listID' MUST contain value 'GS17009:PEPPOL'

Context
/ubl:Catalogue/cac:CatalogueLine/cbc:PackLevelCode
Test
not(@listID) or @listID = 'GS17009:PEPPOL'
Usage
/ ubl:Catalogue / cac:CatalogueLine / cbc:PackLevelCode / @listID