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Recommended Sequence of Configuration Tasks 
You should carry out configuration of the electronic account statement in the following order: In Customizing for Bank Accounting, choose Business Transactions
® Payment Transactions ® Electronic Bank Statement ® Make Global Settings for the Electronic Bank Statement.You should group together all banks that use the same external transaction code for certain business transactions under the same transaction type.
If you want to read account statements containing currency keys that do not meet ISO (and hence SAP) standards, Customizing offers a facility for getting around this problem. You use a currency class to assign the variant currency keys, used by your house banks or customers, to the SAP currency keys. You then store the currency classes in the house bank.
You can find more information on currency classes in the Bank Accounting Implementation Guide (IMG).
