horstoeko\zugferd\entities\minimum\ram\HeaderTradeAgreementType:
    properties:
        sellerTradeParty:
            -
                NotNull:
                    groups:
                        - xsd_rules
            -
                Valid: null
        buyerTradeParty:
            -
                NotNull:
                    groups:
                        - xsd_rules
            -
                Valid: null
        buyerOrderReferencedDocument:
            -
                Valid: null
