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

SAP Error Message - Details

• 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 (e.g., classes starting with CL_).
  
  
  
  Select a Standard Class:
  
  When prompted to select a superclass or reference class, make sure to choose a class that is marked as a standard class. You can do this by using the search help (F4) to find available standard classes.
  
  
  
  Create a New Class:
  
  If you are creating a new class, ensure that you are not trying to inherit from a non-standard class. Instead, select a standard class that fits your requirements.
  
  
  
  Check Class Attributes:
  
  If you are modifying an existing class, check the attributes and ensure that any superclass or interfaces are correctly defined and are standard classes.
  
  
  
  Consult Documentation:
  
  If you are unsure which classes are standard, refer to the SAP documentation or the ABAP class library for a list of standard classes.
  
  
  
  Related Information:
  
  Transaction SE24: This is the transaction code used to create and manage classes in SAP.
  Class Types: In SAP, classes can be standard classes, local classes, interfaces, etc. Understanding the differences is crucial for proper class management.
  SAP Help Portal: For more detailed information on class creation and management, you can refer to the SAP Help Portal or the ABAP documentation.
  
  If you continue to experience issues after following these steps, consider reaching out to your SAP Basis or ABAP development team for further assistance.