What do the fields propBankTransactionCode and tipoOperazione represent and why are the values the same?

Both fields represent the type of operation (internal bank identifiers for the type of operation), but the propBankTransactionCode field is populated directly by the bank (ASPSP).                                                      

The propBankTransactionCode field is populated by the bank (ASPSP), while the tipoOperazione fields include internal identifiers that vary depending on the bank and that represent the type of operation.