Message

[PEPPOL-T004-S351] MaximumVariantQuantity SHOULD NOT be used or MUST be equal to 0 when VariantConstraintIndicator is set to false.

Context
ubl:CallForTenders/cac:TenderingTerms/cbc:VariantConstraintIndicator[normalize-space(.)='false']
Test
count(/ubl:CallForTenders/cac:TenderingTerms/cbc:MaximumVariantQuantity)=0 or normalize-space(/ubl:CallForTenders/cac:TenderingTerms/cbc:MaximumVariantQuantity)='0'