How To Fix KK603 - Internal error: unexpected return code

SAP Error Message - Details

• Message type: E = Error

• Message class: KK -

• Message number: 603

• Message text: Internal error: unexpected return code

What causes this issue?

Internal program error in
<DS:GLOS.3526B20FAFAB52B9E10000009B38F974>function module</> or form
routine &v1&: return code &v2& occurred unexpectedly.
Since this may cause error interpretations in the system, the error
must be removed.

How to fix this error?

Contact your system administrator.
If necessary, contact the SAP Hotline, giving details of the error
message.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message KK603 - Internal error: unexpected return code ?

  The SAP error message KK603, which states "Internal error: unexpected return code," typically occurs in the context of controlling (CO) module transactions, particularly when dealing with cost center accounting, internal orders, or other related functionalities. This error indicates that the system encountered an unexpected situation while processing a request, which could be due to various reasons.
  Possible Causes:
  
  System Bugs: There may be a bug in the SAP system or a specific transaction code that is causing the unexpected return code.
  Configuration Issues: Incorrect configuration settings in the controlling module or related areas can lead to this error.
  Data Inconsistencies: Inconsistent or corrupted data in the database can trigger internal errors.
  Authorization Issues: Lack of proper authorizations for the user executing the transaction can sometimes lead to unexpected behavior.
  Custom Code: If there are custom enhancements or modifications in the system, they might not be handling certain scenarios correctly.
  
  Solutions:
  
  Check SAP Notes: Look for relevant SAP Notes in the SAP Support Portal. SAP often releases notes that address specific error messages and provide patches or workarounds.
  Review Configuration: Verify the configuration settings in the controlling module to ensure they are set up correctly.
  Data Consistency Check: Run consistency checks on the relevant data (e.g., cost centers, internal orders) to identify and correct any inconsistencies.
  Debugging: If you have access to debugging tools, you can analyze the program flow to identify where the unexpected return code is generated.
  User Authorizations: Ensure that the user has the necessary authorizations to perform the transaction.
  Contact SAP Support: If the issue persists, consider reaching out to SAP Support for assistance. Provide them with detailed information about the error, including transaction codes, user actions, and any relevant logs.
  
  Related Information:
  
  Transaction Codes: The error may occur in various transaction codes related to controlling, such as KSB1 (Cost Centers: Actual Line Items), KKAO (Order Settlement), etc.
  System Logs: Check the system logs (transaction SLG1) for any additional error messages or warnings that may provide more context about the issue.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  
  By following these steps, you should be able to diagnose and potentially resolve the KK603 error in your SAP system.