How To Fix SADL_GW_DT_CDS040 - Composition association &1 must not be used with a filter.

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_GW_DT_CDS - Messages CDS Checks

• Message number: 040

• Message text: Composition association &1 must not be used with a filter.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_GW_DT_CDS040 - Composition association &1 must not be used with a filter. ?

  The SAP error message SADL_GW_DT_CDS040 typically occurs in the context of Core Data Services (CDS) views when there is an issue with the way associations are being used in a query, particularly when filters are applied to a composition association.
  Cause:
  The error message indicates that a composition association (which is a type of association that implies a strong ownership relationship between two entities) is being used in a way that is not allowed with a filter. In SAP CDS, composition associations cannot be filtered directly because they imply a strict relationship where the lifecycle of the child entity is tied to the parent entity. 
  Solution:
  To resolve this error, consider the following approaches:
  
  
  Review the Association: Check the definition of the composition association in your CDS view. Ensure that you are not trying to filter on the composition association directly. Instead, you may need to filter on the parent entity or use a different approach to achieve your desired results.
  
  
  Change the Association Type: If filtering is necessary and the relationship allows it, consider changing the composition association to a regular association. This would allow you to apply filters without encountering this error.
  
  
  Use a Different Query Structure: If you need to filter based on the child entity, consider restructuring your query. You might need to join the child entity in a different way or use a subquery to achieve the desired filtering without directly applying it to the composition association.
  
  
  Check for Alternative Filters: If you are trying to filter based on attributes of the child entity, consider filtering on the parent entity's attributes or using a different approach to achieve the same result.
  
  
  Related Information:
  
  CDS Views: Core Data Services (CDS) are a way to define semantically rich data models in SAP. Understanding how associations work in CDS is crucial for effective data modeling.
  Composition vs. Association: In SAP, a composition association indicates a strong relationship where the child cannot exist without the parent. In contrast, a regular association allows for more flexibility, including filtering.
  SAP Documentation: For more detailed information, refer to the official SAP documentation on CDS views and associations, which provides guidelines on how to define and use associations correctly.
  
  By following these steps, you should be able to resolve the SADL_GW_DT_CDS040 error and successfully implement your CDS view without issues.