How To Fix OO626 - Subclasses of persistent classes must also be persistent

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 626

• Message text: Subclasses of persistent classes must also be persistent

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 OO626 - Subclasses of persistent classes must also be persistent ?

  The SAP error message OO626 indicates that you are trying to define a subclass of a persistent class in ABAP (Advanced Business Application Programming) that is not itself marked as persistent. In the context of ABAP Object-Oriented programming, a persistent class is one that is designed to be stored in the database, typically using the ABAP Dictionary.
  Cause:
  The error occurs when:
  
  You have created a subclass of a persistent class (a class that is defined with the persistent keyword).
  The subclass itself is not defined as persistent, which is a requirement in ABAP. All subclasses of a persistent class must also be persistent to ensure that they can be stored in the database.
  
  Solution:
  To resolve this error, you need to ensure that the subclass is also defined as persistent. Here are the steps to do that:
  
  
  Open the Class Definition: Go to the ABAP Workbench (transaction SE80 or SE24) and open the class definition of the subclass that is causing the error.
  
  
  Modify the Class Attributes: In the class definition, ensure that the subclass is marked as persistent. You can do this by:
  
  Going to the class properties.
  Checking the option for "Persistent" or "Database Table" (depending on the version of SAP you are using).
  
  
  
  Save and Activate: After making the changes, save and activate the class. This should resolve the OO626 error.
  
  
  Related Information:
  
  Persistent Classes: These are classes that are linked to database tables and can be used to store data persistently. They are defined in the ABAP Dictionary.
  Subclasses: In object-oriented programming, subclasses inherit properties and methods from their parent classes (superclasses). If the superclass is persistent, the subclass must also be persistent to maintain the integrity of the data model.
  ABAP Documentation: For more detailed information, refer to the official SAP documentation on ABAP Object-Oriented programming and persistent classes.
  
  Additional Tips:
  
  Always ensure that your class hierarchy is designed correctly, especially when dealing with persistent classes.
  If you are unsure about the persistence requirements, consult with your development team or refer to the SAP guidelines for object-oriented programming.
  
  By following these steps, you should be able to resolve the OO626 error and ensure that your class hierarchy is correctly defined in ABAP.