How To Fix 42689 - Different keys are not allowed for the same class

42689 - Overview

• Message type: E = Error

• Message class: 42 - Information Workbench

• Message number: 689

• Message text: Different keys are not allowed for the same class

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message 42689 - Different keys are not allowed for the same class ?

  The SAP error message 42689, which states "Different keys are not allowed for the same class," typically occurs in the context of class-based object-oriented programming in SAP, particularly when dealing with class definitions and their instances.
  
  Cause:
  This error usually arises when there is an attempt to create or manipulate instances of a class that have conflicting keys. In SAP, classes can have attributes that serve as keys, and if two instances of the same class are defined with different keys, the system will throw this error. This can happen in various scenarios, such as:
  
  Inconsistent Key Definitions: When a class is defined with a certain key, and later an attempt is made to create another instance of the same class with a different key definition.
  Inheritance Issues: If a subclass is trying to redefine keys that are already defined in the parent class.
  Data Dictionary Issues: When working with database tables or structures that