[aligned-ibrp-006]-Tax point date (ibt-007) and tax point date code (ibt-008) are mutually exclusive.
aligned-ibrp-006
/ubl:Invoice | /cn:CreditNote
(exists(cbc:TaxPointDate) and not(cac:InvoicePeriod/cbc:DescriptionCode)) or (not(cbc:TaxPointDate) and exists(cac:InvoicePeriod/cbc:DescriptionCode)) or (not(cbc:TaxPointDate) and not(cac:InvoicePeriod/cbc:DescriptionCode))