How To Fix OO198 - Cannot edit the constructor of an exception class

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 198

• Message text: Cannot edit the constructor of an exception class

What causes this issue?

The constructor of an exception class is generated when saving the
class definition. Changing or implementing the interface is not
permitted.

System Response

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

How to fix this error?

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 OO198 - Cannot edit the constructor of an exception class ?

  The SAP error message OO198, which states "Cannot edit the constructor of an exception class," typically occurs in the context of ABAP programming when you attempt to modify the constructor of an exception class. In ABAP, exception classes are used to handle errors and exceptions in a structured way, and they have specific rules regarding their constructors.
  Cause:
  The error arises because:
  
  Exception Class Restrictions: In ABAP, exception classes are defined with certain restrictions. The constructors of exception classes are predefined and cannot be modified. This is to ensure that the exception handling mechanism remains consistent and reliable.
  Incorrect Modification Attempt: You might be trying to add parameters or change the signature of the constructor in a way that is not allowed.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check the Exception Class Definition: Review the definition of the exception class you are trying to modify. Ensure that you are not attempting to change the constructor in a way that violates ABAP's rules for exception classes.
  
  
  Use Alternative Methods: If you need to pass additional information when raising an exception, consider using instance methods or attributes of the exception class instead of modifying the constructor. You can define additional attributes in the exception class and set them after the exception is instantiated.
  
  
  Create a New Exception Class: If you need a different behavior or additional parameters, consider creating a new exception class that extends the existing one or is entirely new, rather than modifying an existing one.
  
  
  Consult Documentation: Refer to the official SAP documentation or ABAP programming guidelines for more information on exception handling and the limitations of exception class constructors.
  
  
  Related Information:
  
  Exception Handling in ABAP: Understanding how exception handling works in ABAP is crucial. Exception classes are typically derived from the standard class CX_STATIC_CHECK or CX_DYNAMIC_CHECK.
  Best Practices: Follow best practices for exception handling, such as using meaningful exception names and providing clear documentation for the exceptions you define.
  Debugging: If you encounter this error during development, use the ABAP debugger to trace where the exception is being raised and how it is being handled.
  
  By adhering to these guidelines and understanding the limitations of exception classes in ABAP, you can effectively manage exceptions in your SAP applications without encountering the OO198 error.