How To Fix KN459 - Key too long

SAP Error Message - Details

• Message type: E = Error

• Message class: KN - Reporting for Costing

• Message number: 459

• Message text: Key too long

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message KN459 - Key too long ?

  The SAP error message KN459 ("Key too long") typically occurs when the key length of a database entry exceeds the maximum allowed length for that particular field or table. This can happen in various scenarios, such as when trying to create or update a customer master record in the SAP system.
  Cause:
  
  Field Length Exceeded: The most common cause is that the data being entered into a key field (like customer number, name, or other identifiers) exceeds the defined length in the database schema.
  Concatenation of Fields: If the key is generated by concatenating multiple fields, the combined length may exceed the limit.
  Custom Development: Custom programs or enhancements may inadvertently create keys that are too long.
  
  Solution:
  
  Check Field Lengths: Review the field lengths defined in the database schema for the relevant tables (e.g., KNA1 for customer master data). Ensure that the data being entered does not exceed these lengths.
  Data Validation: Implement validation checks in your data entry processes to ensure that the data being input adheres to the required lengths.
  Adjust Key Generation Logic: If the key is generated programmatically, modify the logic to ensure that the resulting key does not exceed the maximum length.
  Review Custom Code: If there are custom programs or enhancements, review the code to ensure that it adheres to the key length restrictions.
  Consult Documentation: Refer to SAP documentation or notes related to the specific transaction or table to understand the key length requirements.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or updates related to the error message KN459. SAP frequently releases notes that address specific error messages and provide guidance on how to resolve them.
  Transaction Codes: Use transaction codes like SE11 (Data Dictionary) to check the structure of the relevant tables and fields.
  Debugging: If the error occurs in a custom program, consider using the debugger to trace the execution and identify where the key length is being exceeded.
  Testing: After making changes, conduct thorough testing to ensure that the issue is resolved and that no new issues are introduced.
  
  By following these steps, you should be able to identify the cause of the KN459 error and implement a solution to resolve it.