How To Fix R-338 - RWKN must not be empty for a complex class

SAP Error Message - Details

• Message type: E = Error

• Message class: R- -

• Message number: 338

• Message text: RWKN must not be empty for a complex class

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message R-338 - RWKN must not be empty for a complex class ?

  The SAP error message R-338, which states "RWKN must not be empty for a complex class," typically occurs in the context of working with classification in SAP, particularly when dealing with complex classes in the classification system.
  Cause:
  The error indicates that the "RWKN" (which stands for "Reference Key Number") field is required for complex classes but has not been filled in. Complex classes in SAP are used to represent objects that can have multiple characteristics and values, and the RWKN is essential for identifying these objects uniquely.
  Solution:
  To resolve this error, you need to ensure that the RWKN field is populated correctly. Here are the steps you can take:
  
  
  Check the Class Definition:
  
  Go to the transaction code CL02 (Change Class) or CL03 (Display Class).
  Find the complex class that is causing the error.
  Ensure that the RWKN field is filled in the class definition.
  
  
  
  Maintain the RWKN:
  
  If the RWKN is empty, you will need to enter a valid value. This value should correspond to the unique identifier for the object you are classifying.
  Save the changes after entering the RWKN.
  
  
  
  Review Related Objects:
  
  If the complex class is linked to other objects (like characteristics or object dependencies), ensure that those are also correctly defined and linked.
  
  
  
  Check for Customizations:
  
  If your organization has custom developments or enhancements in the classification system, check if there are any specific requirements or custom logic that might affect the RWKN field.
  
  
  
  Testing:
  
  After making the necessary changes, try to execute the transaction or process that was causing the error again to see if the issue is resolved.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  CL01: Create Class
  CL02: Change Class
  CL03: Display Class
  CL24: Class Hierarchy
  
  
  Documentation: Refer to SAP Help documentation for detailed information on classification and complex classes.
  SAP Notes: Check for any relevant SAP Notes that might address specific issues related to this error message.
  
  If the problem persists after following these steps, it may be beneficial to consult with your SAP support team or refer to SAP community forums for additional insights.