How To Fix WEBFI_MASTER304 - Bank details with bank number & and account number & already exist

SAP Error Message - Details

• Message type: E = Error

• Message class: WEBFI_MASTER - Web Financials: Business Partner Master Data

• Message number: 304

• Message text: Bank details with bank number & and account number & already exist

Self-Explanatory Message

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• What is the cause and solution for SAP error message WEBFI_MASTER304 - Bank details with bank number & and account number & already exist ?

  The SAP error message:
  WEBFI_MASTER304: Bank details with bank number & and account number & already exist
  
  Cause:
  This error occurs when you try to create or update bank details (such as a bank account) for a vendor, customer, or employee in SAP, but the combination of bank number and account number you are entering already exists in the system for another master record. SAP enforces uniqueness for bank details to avoid duplicate entries and potential payment errors.
  In other words, the system detects that the bank account you are trying to assign is already linked to another master record, which is not allowed.
  
  Where it typically occurs:
  
  Vendor master data (transaction FK01/FK02)
  Customer master data (transaction XD01/XD02)
  Employee master data (HR module)
  Bank master data maintenance
  
  
  Solution:
  
  
  Check existing bank details:
  
  Use transaction FI12 (Bank Directory) or FI13 (Display Bank) to verify the bank number.
  Check if the bank account number is already assigned to another vendor/customer/employee.
  
  
  
  Identify the conflicting master record:
  
  Use reports or tables to find where the bank account is already used.
  Tables to check:
  
  LFBK (Vendor Bank Details)
  KNBK (Customer Bank Details)
  BNKA (Bank Master Data)
  
  
  
  
  
  Decide on the action:
  
  If the bank account is wrongly assigned to another master record, correct or delete the incorrect entry.
  If the bank account is genuinely shared (which is rare and usually not allowed), you may need to consult your business process or SAP support for a workaround.
  
  
  
  Use a different bank account number:
  
  If the bank account is correctly assigned elsewhere, you must use a different bank account number for the current master record.
  
  
  
  Check for leading/trailing spaces or formatting issues:
  
  Sometimes, the system treats bank numbers or account numbers with spaces or different formats as different entries. Ensure consistent formatting.
  
  
  
  
  Additional Information:
  
  SAP enforces uniqueness of bank details to prevent payment processing errors.
  This error helps maintain data integrity in financial transactions.
  If you believe this is a system error or a false positive, check OSS notes or SAP support for patches or known issues.
  In some cases, customizing or user-exits might affect bank detail validations.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  WEBFI_MASTER304: Bank details with bank number & and account number & already exist
  
  
  Cause
  Duplicate bank number & account number combination assigned to multiple master records
  
  
  Solution
  Verify existing bank details, correct duplicates, or use a different bank account number
  
  
  
  
  If you need help identifying the conflicting master record, you can run a query on table LFBK or KNBK filtering by bank number and account number to find the existing assignment.
  
  Let me know if you want a step-by-step guide on how to find the conflicting record or any other help!