[IBR-173-OM] - If Buyer electronic address (IBT-049) is '997770000099', Seller UUID (BTOM-004) MUST be present.
IBR-173-OMubl:Invoice | cn:CreditNote not(normalize-space(cac:AccountingCustomerParty/cac:Party/cbc:EndpointID) = '997770000099') or normalize-space(cac:AccountingSupplierParty/cbc:AdditionalAccountID) != ''