CreditorSchemeIdentificationRule (DD)
If CreditorSchemeIdentification is present, then DirectDebitTransactionInformation/CreditorSchemeIdentification is not allowed.
If DirectDebitTransactionInformation/CreditorSchemeIdentification is present, then CreditorSchemeIdentification is not allowed.
DirectDebitTransactionInformation/CreditorSchemeIdentification and CreditorSchemeIdentification may both be
absent.