How To Fix SADL_EXPOSURE054 - Key element &1 of entity &2 is not uniquely associated to element of &3

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_EXPOSURE - Errors During Exposure Compilation

• Message number: 054

• Message text: Key element &1 of entity &2 is not uniquely associated to element of &3

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_EXPOSURE054 - Key element &1 of entity &2 is not uniquely associated to element of &3 ?

  The SAP error message SADL_EXPOSURE054 indicates that there is an issue with the uniqueness of a key element in the context of a data exposure layer (often related to the SAP ABAP programming model for SAP Fiori applications). This error typically arises when the key element specified in the entity is not uniquely associated with the corresponding element in the underlying data model.
  Cause:
  The error can occur due to several reasons:
  
  Non-Unique Key Definition: The key element defined in the entity is not unique in the underlying data source. This means that there are multiple records in the database that share the same key value.
  Incorrect Mapping: There may be an issue with how the key elements are mapped between the entity and the underlying data source.
  Data Integrity Issues: The data in the underlying database may have integrity issues, such as duplicate entries that violate the uniqueness constraint.
  
  Solution:
  To resolve the SADL_EXPOSURE054 error, you can take the following steps:
  
  
  Check Key Definitions:
  
  Review the key definitions in your entity and ensure that they are correctly defined and that they correspond to unique fields in the underlying data source.
  
  
  
  Verify Data Uniqueness:
  
  Query the underlying database table to check for duplicate entries based on the key element. You can use SQL queries to identify duplicates.
  If duplicates exist, you may need to clean up the data to ensure that the key is unique.
  
  
  
  Adjust Mapping:
  
  If you are using a CDS (Core Data Services) view or an OData service, ensure that the mapping of the key elements is correctly defined. Check the annotations and ensure that the key fields are properly specified.
  
  
  
  Modify the Data Model:
  
  If necessary, consider modifying the data model to include additional fields in the key definition to ensure uniqueness.
  
  
  
  Testing:
  
  After making changes, test the entity again to ensure that the error is resolved.
  
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for SADL (Service Adaptation Definition Language) and the ABAP programming model for more details on how to define entities and manage data exposure.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and to find additional solutions or workarounds.
  Debugging Tools: Use debugging tools in the ABAP environment to trace the execution and identify where the uniqueness constraint is being violated.
  
  By following these steps, you should be able to identify the root cause of the SADL_EXPOSURE054 error and implement a solution to resolve it.