How To Fix CL526 - Select a class as a standard class

CL526 - Overview

• Message type: E = Error

• Message class: CL - Classification

• Message number: 526

• Message text: Select a class as a standard class

What causes this issue?

You have allocated an object to more than one class, but have not
selected one of the classes as <DS:GLOS.standard_class>standard
class</>.

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?

Select one of the classes to which the object is allocated as standard
class.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CL526 - Select a class as a standard class ?

  The SAP error message CL526, which states "Select a class as a standard class," typically occurs when you are trying to create or modify a class in the ABAP Workbench (transaction SE24) and the system requires you to specify a standard class.
  
  Cause:
  This error usually arises in the following scenarios:
  
  Class Type Selection: When creating a new class, the system expects you to select a standard class as a superclass or as a reference. If you do not select a valid standard class, the error will be triggered.
  Incorrect Class Type: You may be trying to use a class that is not defined as a standard class (e.g., a local class or an interface) when the system expects a standard class.
  
  
  Solution:
  To resolve the CL526 error, follow these steps:
  
  
  Check Class Type:
  
  Ensure that you are selecting a valid standard class. Standard classes in SAP are typically those that are part of the SAP standard library