How To Fix WER_CUST004 - Class &1 doesn't extend class &2.

SAP Error Message - Details

• Message type: E = Error

• Message class: WER_CUST -

• Message number: 004

• Message text: Class &1 doesn't extend class &2.

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message WER_CUST004 - Class &1 doesn't extend class &2. ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WER_CUST004 Class &1 doesn't extend class &2.
  
  Cause:
  This error occurs when a class (denoted by &1) is expected to be a subclass (i.e., it should inherit from) another class (denoted by &2), but it does not. In other words, the system checks the inheritance relationship between two classes and finds that the first class does not extend the second class as required.
  This typically happens in scenarios where:
  
  A class is expected to implement or extend a specific superclass/interface as per configuration or coding logic.
  Custom or standard code tries to instantiate or use a class assuming it inherits from a particular base class, but the actual class does not.
  In enhancement or extension scenarios, the system expects a certain inheritance hierarchy to be maintained.
  
  
  Solution:
  
  
  Check Class Inheritance:
  
  Go to transaction SE24 (Class Builder).
  Enter the class name &1.
  Check the Superclass tab or the inheritance hierarchy.
  Verify if the class &1 extends the class &2.
  
  
  
  Correct the Class Hierarchy:
  
  If the class &1 is supposed to extend &2 but does not, modify the class &1 to inherit from &2.
  This may involve adjusting the class definition or creating a new class that properly extends the required superclass.
  
  
  
  Adjust Configuration or Code:
  
  If the class &1 is not meant to extend &2, then check the configuration or code that expects this inheritance.
  Correct the configuration or code to refer to the correct class or adjust the logic to handle the actual class hierarchy.
  
  
  
  Check for Typographical Errors:
  
  Sometimes, the class names might be mistyped in the configuration or code.
  Verify the class names are correct and consistent.
  
  
  
  Consult Documentation or Development Team:
  
  If this is related to a custom development or enhancement, consult the development team or documentation to understand the intended class hierarchy.
  
  
  
  
  Related Information:
  
  This error is common in Object-Oriented ABAP programming where inheritance is used.
  It can occur in various SAP modules where class-based enhancements or BAdIs (Business Add-Ins) are implemented.
  The message is part of the WER_CUST message class, which is often related to workflow or custom development.
  Use transaction SE91 to look up the message class WER_CUST for more details.
  If this error occurs during runtime, check the stack trace or debugger to identify where the class check fails.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  Class &1 doesn't extend class &2
  
  
  Cause
  Class inheritance relationship not met
  
  
  Solution
  Verify and correct class inheritance or adjust code/configuration
  
  
  Tools
  SE24 (Class Builder), SE91 (Message Class), Debugger
  
  
  
  
  If you provide the actual class names (&1 and &2), I can help you with more specific guidance.