How To Fix SADL_GEN_DRFT_MSG059 - Association &2 of CDS-View &1 must use target's primary key as constraint

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_GEN_DRFT_MSG - Message for Draft generation

• Message number: 059

• Message text: Association &2 of CDS-View &1 must use target's primary key as constraint

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_GEN_DRFT_MSG059 - Association &2 of CDS-View &1 must use target's primary key as constraint ?

  The SAP error message SADL_GEN_DRFT_MSG059 indicates that there is an issue with the association defined in a Core Data Services (CDS) view. Specifically, it states that the association must use the primary key of the target entity as a constraint. This is a common requirement in SAP when defining associations to ensure data integrity and proper linking between entities.
  Cause
  The error typically arises when:
  
  The association in the CDS view does not correctly reference the primary key of the target entity.
  The association is defined without specifying the necessary constraints that link it to the primary key of the target entity.
  There may be a mismatch in the data types or the fields used in the association.
  
  Solution
  To resolve this error, you can follow these steps:
  
  
  Check the Association Definition:
  
  Review the association in your CDS view. Ensure that it is correctly defined to reference the primary key of the target entity.
  The association should look something like this:
  association [0..*] to TargetEntity as _TargetEntity
    on $projection.KeyField = _TargetEntity.KeyField
  
  
  
  
  Use Primary Key Fields:
  
  Ensure that the fields used in the on clause of the association are indeed the primary key fields of the target entity. If they are not, modify the association to use the correct fields.
  
  
  
  Check Data Types:
  
  Ensure that the data types of the fields used in the association match. If there is a mismatch, you may need to cast the fields or adjust the data types accordingly.
  
  
  
  Review the CDS View:
  
  If the association is part of a larger CDS view, ensure that the overall structure and logic of the view are correct. Sometimes, issues in other parts of the view can lead to this error.
  
  
  
  Activate the CDS View:
  
  After making the necessary changes, activate the CDS view again to see if the error persists.
  
  
  
  Related Information
  
  CDS Views: Core Data Services (CDS) is a framework for defining semantically rich data models in SAP. Understanding how to define associations and relationships is crucial for effective data modeling.
  Primary Keys: In database design, a primary key is a unique identifier for a record in a table. It is essential for establishing relationships between tables.
  SAP Documentation: Refer to the official SAP documentation for more details on defining associations in CDS views and best practices for data modeling.
  
  If you continue to face issues after following these steps, consider checking the SAP Community or reaching out to SAP support for further assistance.