How To Fix SADL_GW_DT_CDS042 - Aggregation and grouping is not allowed in consumption CDS view.

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_GW_DT_CDS - Messages CDS Checks

• Message number: 042

• Message text: Aggregation and grouping is not allowed in consumption CDS view.

Self-Explanatory Message

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• What is the cause and solution for SAP error message SADL_GW_DT_CDS042 - Aggregation and grouping is not allowed in consumption CDS view. ?

  The SAP error message SADL_GW_DT_CDS042 indicates that there is an issue with the use of aggregation and grouping in a consumption CDS (Core Data Services) view. This error typically arises when you attempt to use aggregation functions (like SUM, COUNT, etc.) or GROUP BY clauses in a CDS view that is intended for consumption, which is not allowed.
  Cause:
  
  Consumption CDS View Restrictions: Consumption CDS views are designed to provide a simplified view of data for reporting and analytics. They are not meant to perform complex aggregations or groupings. Instead, they should focus on providing a flat structure of data.
  Incorrect View Definition: If the CDS view is defined with aggregation or grouping logic, it will trigger this error when you try to consume it in an OData service or other contexts that expect a non-aggregated view.
  
  Solution:
  
  Separate Aggregation Logic: If you need to perform aggregations, create a separate analytical CDS view instead of a consumption CDS view. Analytical views are designed to handle aggregations and can be used for reporting purposes.
  Modify the CDS View: Review the definition of your consumption CDS view and remove any aggregation or grouping logic. Ensure that the view only selects fields without applying any aggregate functions.
  Use a Calculation View: If you are using SAP HANA, consider creating a calculation view that can handle complex logic, including aggregations, and then expose that view as needed.
  
  Related Information:
  
  
  CDS View Types: Understand the different types of CDS views:
  
  Basic CDS Views: Simple views without aggregation.
  Consumption CDS Views: Designed for reporting and analytics, should not include aggregation.
  Analytical CDS Views: Designed for aggregations and complex calculations.
  
  
  
  Documentation: Refer to the official SAP documentation on CDS views for best practices and guidelines on how to structure your views correctly.
  
  
  SAP Notes: Check for any relevant SAP Notes or Knowledge Base Articles that might provide additional insights or updates related to this error.
  
  
  By following these guidelines, you should be able to resolve the SADL_GW_DT_CDS042 error and structure your CDS views appropriately for your reporting needs.