How To Fix FKKMA158 - Choose a unique key

SAP Error Message - Details

• Message type: E = Error

• Message class: FKKMA - Messages for Master Agreement

• Message number: 158

• Message text: Choose a unique key

What causes this issue?

The entered key exists for simple filters, business-partner-specific
filters, and function modules.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Use the input help to select a unique key.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FKKMA158 - Choose a unique key ?

  The SAP error message FKKMA158 ("Choose a unique key") typically occurs in the context of the SAP Contract Accounts Receivable and Payable (FI-CA) module. This error indicates that the system requires a unique key for a specific operation, but the provided key is not unique, leading to ambiguity in the data being processed.
  Cause:
  
  Duplicate Entries: The most common cause of this error is that there are duplicate entries in the database that match the criteria for the operation you are trying to perform.
  Incorrect Data Input: The user may have entered data that does not uniquely identify a record, such as multiple records with the same reference number or key fields.
  Configuration Issues: There may be issues with the configuration of the system that lead to the generation of non-unique keys.
  
  Solution:
  
  Check for Duplicates: Review the entries in the relevant tables (e.g., contract accounts, customer accounts) to identify any duplicates. You can use transaction codes like SE16 or SE16N to view the data in the relevant tables.
  Correct Data Entry: Ensure that the data being entered is unique. If you are entering a reference number or key, verify that it does not already exist in the system.
  Adjust Configuration: If the issue is related to configuration, consult with your SAP administrator or functional consultant to review the settings and ensure that they are set up to enforce uniqueness where necessary.
  Use Unique Identifiers: When performing operations that require a key, always use unique identifiers (like document numbers, account numbers, etc.) to avoid ambiguity.
  Debugging: If you have access to debugging tools, you can analyze the program logic to see where the uniqueness check is failing.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as FBL1N (Vendor Line Item Display), FBL3N (G/L Account Line Item Display), and FBL5N (Customer Line Item Display) to check for duplicates.
  SAP Notes: Check the SAP Support Portal for any notes related to this error message. There may be specific patches or updates that address known issues.
  Documentation: Review SAP documentation for the FI-CA module to understand how keys are generated and managed within the system.
  
  If the problem persists after trying the above solutions, it may be beneficial to reach out to SAP support or your internal IT team for further assistance.