Preparing a data structure key for a bank statement is a process for importing financial data into accounting systems. The key makes it possible to define the structure and format of the data, which facilitates its later processing and analysis. Scope: Defining the data structure – clearly defining the individual fields of the bank statement (such as transaction date, description, amount, account number, transaction type). Mapping columns – assigning the columns of the statement file to the corresponding fields in the accounting system, ensuring consistency and automatic data loading. Setting data types – specifying the data type of each field (e.g. text, number, date). Validation and verification – developing validation rules that check the correctness of the data during import, reducing the risk of errors.