How To Fix CFD_REGISTRY_CHECK104 - CDS View &1 must not use UNION operator

CFD_REGISTRY_CHECK104 - Overview

• Message type: E = Error

• Message class: CFD_REGISTRY_CHECK - Custom Fields: Messages for Registry Check

• Message number: 104

• Message text: CDS View &1 must not use UNION operator

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 CFD_REGISTRY_CHECK104 - CDS View &1 must not use UNION operator ?

  The SAP error message CFD_REGISTRY_CHECK104 indicates that a Core Data Services (CDS) view is using the UNION operator, which is not allowed in certain contexts within the SAP system. This restriction is typically in place because the UNION operator can lead to performance issues and complications in data modeling, especially when dealing with certain types of data consumption or integration scenarios.
  
  Cause:
  The error occurs when a CDS view is defined with a UNION operator. This can happen if:
  
  The developer has combined multiple data sources using UNION in the CDS view definition.
  The CDS view is intended to be used in a context that does not support UNION operations, such as when it is being consumed by certain analytical tools or when it is part of a larger data model that requires specific performance characteristics.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Remove the UNION Operator: 
  
  Refactor the CDS view to eliminate