How To Fix ACM_SYNTAX166 - Illegal condition for an entity of type "CDS Hierarchy"

SAP Error Message - Details

• Message type: E = Error

• Message class: ACM_SYNTAX - ACM: DCL Syntax Error Messages

• Message number: 166

• Message text: Illegal condition for an entity of type "CDS Hierarchy"

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 ACM_SYNTAX166 - Illegal condition for an entity of type "CDS Hierarchy" ?

  The SAP error message ACM_SYNTAX166, which indicates an "Illegal condition for an entity of type 'CDS Hierarchy'," typically arises in the context of Core Data Services (CDS) views or hierarchies in SAP systems. This error suggests that there is a syntax or logical issue in the definition of a CDS hierarchy.
  Causes:
  
  Incorrect Hierarchy Definition: The hierarchy may not be defined correctly, such as missing required fields or incorrect relationships between nodes.
  Invalid Conditions: The conditions specified in the CDS view may not be valid for the hierarchy structure, such as using unsupported operators or functions.
  Data Model Issues: There may be inconsistencies in the underlying data model that the CDS hierarchy is based on, such as missing or incorrect foreign key relationships.
  Version Compatibility: The error may also arise if there are compatibility issues with the version of the SAP system or the CDS features being used.
  
  Solutions:
  
  Review the CDS Definition: Check the syntax and structure of the CDS hierarchy definition. Ensure that all required fields are included and that the relationships between nodes are correctly defined.
  Validate Conditions: Ensure that any conditions applied in the CDS view are valid for the hierarchy. Avoid using unsupported functions or operators.
  Check Data Model: Verify the underlying data model for any inconsistencies. Ensure that all necessary foreign key relationships are correctly established.
  Use CDS Annotations: Make sure to use the appropriate annotations for defining hierarchies in CDS views, such as @Hierarchy and @HierarchyRoot.
  Test with Simplified Queries: If the hierarchy is complex, try simplifying the query to isolate the issue. Start with a basic hierarchy and gradually add complexity to identify the point of failure.
  Consult Documentation: Refer to the official SAP documentation for Core Data Services and hierarchies to ensure compliance with best practices and syntax rules.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to the error message ACM_SYNTAX166.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found.
  Debugging Tools: Utilize SAP debugging tools to trace the execution of the CDS view and identify where the error occurs.
  
  If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance, providing them with detailed information about the error and the context in which it occurs.