How To Fix FKKMA157 - Choose a unique key

SAP Error Message - Details

• Message type: E = Error

• Message class: FKKMA - Messages for Master Agreement

• Message number: 157

• Message text: Choose a unique key

What causes this issue?

The key entered exists for both a product and a group.

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 FKKMA157 - Choose a unique key ?

  The SAP error message FKKMA157: Choose a unique key typically occurs in the context of the SAP Convergent Charging (SAP CC) or SAP Contract Accounts Receivable and Payable (SAP FI-CA) modules. This error indicates that the system has encountered a situation where it requires a unique identifier (key) for a specific operation, but the provided key is not unique.
  Causes:
  
  Duplicate Entries: The most common cause is that there are duplicate entries in the database for the key you are trying to use. This could be due to incorrect data entry or a failure in the data processing logic.
  Configuration Issues: There may be issues with the configuration of the relevant tables or data structures that are supposed to enforce uniqueness.
  Data Migration Issues: If data has been migrated from another system, it’s possible that the migration process did not enforce uniqueness, leading to duplicates.
  Concurrent Processing: If multiple processes are trying to create or update records simultaneously, it may lead to conflicts and duplicates.
  
  Solutions:
  
  Check for Duplicates: Review the database or the relevant tables to identify any duplicate entries for the key in question. You can use SQL queries or SAP transaction codes to check for duplicates.
  Correct Data: If duplicates are found, you may need to correct or delete the duplicate entries to ensure that each key is unique.
  Review Configuration: Check the configuration settings for the relevant module to ensure that uniqueness constraints are properly defined.
  Data Validation: Implement data validation checks in your processes to prevent duplicates from being created in the first place.
  Transaction Management: If the error is due to concurrent processing, consider implementing transaction management techniques to handle concurrent updates more effectively.
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like SE11 (Data Dictionary), SE16 (Data Browser), or SE80 (Object Navigator) to investigate the underlying tables and data.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Documentation: Review the documentation for the specific module you are working with (e.g., SAP FI-CA or SAP CC) for best practices regarding data management and key uniqueness.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP support team or reach out to SAP support for further assistance.