UltimateDebtorRule
If PmtInf/UltimateDebtor is present, then CreditTransferTransactionInformation/UltimateDebtor is not allowed.
If CreditTransferTransactionInformation/UltimateDebtor is present, then PmtInf/UltimateDebtor is not allowed.
CreditTransferTransactionInformation/UltimateDebtor and UltimateDebtor may both be absent.