In Customizing for Financial Accounting (FI), choose  Accounts Receivable and Accounts Payable Business Transactions Outgoing Payments Automatic Outgoing Payments Payment Media Country-Specific Settings for Payment Media Define User Number at Bank for Norway, United Kingdom, and Ireland .

If only one user number applies to all company codes (one paying company code), enter the six-digit number in positions 5–10 of the User Number field and leave the Company Code and Bank Number fields at their initial values. You only have to make an entry in the Bank Number field if you are using multiple BACS user numbers within one paying company code. In this case, you enter a key of your choice for each BACS number. When the data medium is generated, you must specify this alternative search key for each number.

In Customizing for FI, choose  Accounts Receivable and Accounts Payable Business Transactions Outgoing Payments Automatic Outgoing Payments Payment Media Country-Specific Settings for Payment Media Define Bank Transaction Code for United Kingdom.

If only one user number applies to all SAP company codes, leave the Bank Number field empty. If you are using multiple BACS user numbers, enter the relevant alternative search key in the Bank Number field. For each payment method used for BACS payment file creation, you have to define a bank transaction code for the standard transaction records and contra record(s). For outgoing payments, the standard transaction record code is 99 and the contra record is 17.