[ALIGNED-IBRP-Z-05-OM] - In an Invoice line (IBG-25) where the Invoiced item VAT category code (IBT-151) is "Zero rated" the Invoiced item VAT rate (IBT-152) MUST be 0 (zero).
ALIGNED-IBRP-Z-05-OMcac:InvoiceLine | cac:CreditNoteLinenot($vatCategory = 'Z') or xs:decimal($vatRate) = 0