How To Fix CLB023 - The application key can be set only once

SAP Error Message - Details

• Message type: E = Error

• Message class: CLB - SAIL: Common messages

• Message number: 023

• Message text: The application key can be set only once

What causes this issue?

Some methods need a so called application key for identifcation purposes
and for accessing the customizing. This key must be set just once at
initialization time. A second attempt is treated as error.

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

System Response

The method in progress will be cancelled.

How to fix this error?

This error can be solved by a code change only.

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 CLB023 - The application key can be set only once ?

  The SAP error message CLB023 ("The application key can be set only once") typically occurs in the context of SAP's Classification System or when dealing with application keys in the SAP system. This error indicates that an attempt is being made to set an application key that has already been set for a particular object or instance.
  Cause:
  
  Duplicate Setting: The most common cause of this error is that the application key is being set multiple times for the same object. In SAP, application keys are designed to be unique identifiers for specific applications or functionalities, and they can only be assigned once to an object.
  Incorrect Logic in Custom Code: If there is custom ABAP code or enhancements that manipulate application keys, there may be logic errors that attempt to set the key again.
  Data Consistency Issues: There may be inconsistencies in the data or configuration that lead to the system trying to set the application key again.
  
  Solution:
  
  Check for Existing Keys: Before attempting to set the application key, ensure that it has not already been set for the object in question. You can do this by checking the relevant tables or using transaction codes that display the object’s details.
  Review Custom Code: If there is custom code involved, review it to ensure that it does not attempt to set the application key more than once. Look for any loops or conditions that might lead to multiple assignments.
  Debugging: If the issue is not immediately apparent, consider debugging the process to see where the application key is being set and why it is being attempted again.
  Consult Documentation: Review SAP documentation or notes related to the specific application or module you are working with to see if there are any known issues or additional configuration steps required.
  SAP Support: If the issue persists and you cannot find a resolution, consider reaching out to SAP support for assistance. They may have additional insights or patches that can resolve the issue.
  
  Related Information:
  
  Transaction Codes: Depending on the context, you may want to use transaction codes like CL02 (Change Class) or CL03 (Display Class) to investigate the classification settings.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that might address this specific error or provide guidance on handling application keys.
  Documentation: Review the SAP Help Portal for documentation on the Classification System and application keys to understand their intended use and limitations.
  
  By following these steps, you should be able to identify the cause of the CLB023 error and implement a solution to resolve it.