How To Fix DDLS460 - View contains union: extension through extends is not possible

DDLS460 - Overview

• Message type: E = Error

• Message class: DDLS - For DDL source handling

• Message number: 460

• Message text: View contains union: extension through extends is not possible

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.

DDLS460 - Details

• The SAP error message DDLS460 indicates that there is an issue with a database view that contains a UNION operation. Specifically, the error states that the view cannot be extended using the EXTENDS keyword because it contains a UNION. This is a limitation in the way SAP handles views in the Data Dictionary.
  
  Cause:
  The error occurs when you attempt to extend a database view that is defined using a UNION operation. In SAP, views that are created with UNION cannot be extended because the structure of the resulting dataset is not uniform across all branches of the UNION. This means that the system cannot guarantee that the additional fields you want to add will be compatible with all parts of the UNION.
  
  Solution:
  To resolve this issue, you have a few options:
  
  
  Avoid Extending the View: If possible, do not attempt to extend the view. Instead, create a new view that includes the desired