Message

The Type for Classification MUST be "http://publications.europa.eu/resource/authority/cpv/cpv" or "http://publications.europa.eu/resource/authority/cpv/cpvsuppl".

Context
query:QueryRequest/query:Query/rim:Slot[@name='Classification']
Test
normalize-space(./@type) = 'http://publications.europa.eu/resource/authority/cpv/cpv' or normalize-space(./@type) = 'http://publications.europa.eu/resource/authority/cpv/cpvsuppl'
Usage
/ query:QueryRequest / query:Query / rim:Slot@name=Classification / @type