How To Fix SADL_GW_DT_CDS020 - CDS view &1: Association &2 may use fields of target primary key only.

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_GW_DT_CDS - Messages CDS Checks

• Message number: 020

• Message text: CDS view &1: Association &2 may use fields of target primary key only.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_GW_DT_CDS020 - CDS view &1: Association &2 may use fields of target primary key only. ?

  The SAP error message SADL_GW_DT_CDS020 indicates that there is an issue with the definition of an association in a Core Data Services (CDS) view. Specifically, the error states that the association is using fields that are not part of the primary key of the target entity. This is a common issue when defining associations in CDS views, as they must adhere to certain rules regarding primary keys.
  Cause
  The error occurs when:
  
  An association in a CDS view is defined using fields that are not part of the primary key of the target entity.
  The association is expected to link to a unique record in the target entity, which can only be done using primary key fields.
  
  Solution
  To resolve this error, you should:
  
  
  Check the Association Definition: Review the association in your CDS view. Ensure that the fields used in the association are part of the primary key of the target entity.
  Example:
  define association to target_entity as _TargetEntity
  on $projection.field1 = target_entity.primary_key_field1
  and $projection.field2 = target_entity.primary_key_field2
  
  
  Modify the Association: If the fields used in the association are not part of the primary key, you will need to modify the association to use the correct primary key fields.
  
  
  Review the Target Entity: If necessary, check the definition of the target entity to confirm its primary key fields. You can do this by looking at the data model or the underlying database table.
  
  
  Test the Changes: After making the necessary adjustments, activate the CDS view and test it to ensure that the error is resolved.
  
  
  Related Information
  
  CDS Views: Core Data Services (CDS) are a way to define semantic data models in SAP. They allow for the definition of complex data models and associations between entities.
  Associations: In CDS, associations are used to define relationships between different entities. They are similar to foreign keys in relational databases but are more flexible and powerful.
  Primary Keys: A primary key is a unique identifier for a record in a database table. In CDS views, associations must link to primary key fields to ensure data integrity and uniqueness.
  
  Additional Tips
  
  Always ensure that your associations are logically sound and reflect the actual relationships in your data model.
  Use the SAP documentation and community forums for additional examples and best practices related to CDS views and associations.
  If you continue to face issues, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.