How To Fix DDLS_HIER021 - Spantree is not yet supported for hierarchies in CDS

DDLS_HIER021 - Overview

• Message type: E = Error

• Message class: DDLS_HIER - Used for DDL Hierarchies

• Message number: 021

• Message text: Spantree is not yet supported for hierarchies in CDS

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.

DDLS_HIER021 - Details

• The SAP error message DDLS_HIER021 indicates that the use of a "spanning tree" (spantree) is not supported for hierarchies in Core Data Services (CDS) views. This error typically arises when you are trying to create or use a hierarchy in a CDS view that involves a spanning tree structure, which is not currently supported by the CDS framework.
  
  Cause:
  The primary cause of this error is the attempt to define a hierarchy in a CDS view that utilizes a spanning tree structure. In SAP, hierarchies are often used to represent parent-child relationships, but the CDS framework has certain limitations regarding the types of hierarchies it can handle. Specifically, spanning trees, which allow for multiple paths between nodes, are not supported.
  
  Solution:
  To resolve this error, consider the following approaches:
  
  
  Review Hierarchy Structure: Ensure that the hierarchy you are trying to implement does not require a spanning tree. You may need to redesign your hierarchy to