In this configuration activity you are preparing item interest calculations. In this step you can make additional settings to the one made in arrears calculation.
Transaction: S_P6B_12000174
IMG Path: Financial Accounting (New) -> Accounts Receivable and Accounts Payable -> Business Transactions -> Interest Calculation Global Settings -> Prepare Item Interest Calculation
Table: T056U
When you open the transaction you will get a list of item interest calculations.