How To Fix DD_CHK_COMPLEXITY101 - CDS view &1 refers to too many tables

SAP Error Message - Details

• Message type: E = Error

• Message class: DD_CHK_COMPLEXITY - Messages of CDS complexity check

• Message number: 101

• Message text: CDS view &1 refers to too many tables

What causes this issue?

The number of joined tables in the CDS view exceeds the limit of the
most restrictive database supported by SAP. As a result, this view
cannot be activated on all databases supported by SAP.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Reduce the number of joined tables in the CDS view.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DD_CHK_COMPLEXITY101 - CDS view &1 refers to too many tables ?

  The SAP error message DD_CHK_COMPLEXITY101 indicates that a Core Data Services (CDS) view is referencing too many tables, which exceeds the allowed limit. This is a complexity check that ensures performance and maintainability of the CDS views.
  Cause:
  The error occurs when a CDS view references more tables than the system allows. This limit is in place to prevent performance issues that can arise from overly complex queries that involve too many joins or data sources. The specific limit can vary based on the SAP system version and configuration, but it is generally around 16 tables.
  Solution:
  To resolve this error, you can consider the following approaches:
  
  
  Simplify the CDS View:
  
  Review the CDS view and identify if all the referenced tables are necessary. Remove any tables that are not essential for the data you need.
  If possible, break down the CDS view into multiple simpler views. You can create smaller CDS views that can be reused in other views.
  
  
  
  Use Associations:
  
  Instead of directly joining multiple tables, consider using associations. Associations allow you to define relationships between entities without directly joining them in the SQL query, which can help reduce complexity.
  
  
  
  Refactor the Logic:
  
  Analyze the logic of the CDS view. Sometimes, complex calculations or aggregations can be moved to a different layer, such as ABAP code or a different CDS view, to reduce the number of tables involved.
  
  
  
  Check for Redundant Joins:
  
  Ensure that there are no redundant joins in your CDS view. Sometimes, tables may be joined multiple times or in ways that can be optimized.
  
  
  
  Consult Documentation:
  
  Refer to the SAP documentation for your specific version to understand the limitations and best practices for creating CDS views.
  
  
  
  Related Information:
  
  Performance Considerations: Keep in mind that even if you manage to reference more tables, performance can degrade significantly. Always aim for efficient data retrieval.
  SAP Notes: Check for any relevant SAP Notes that might provide additional guidance or updates regarding this error.
  CDS View Annotations: Utilize annotations effectively to enhance the performance and usability of your CDS views.
  
  By following these steps, you should be able to resolve the DD_CHK_COMPLEXITY101 error and create a more efficient CDS view.