How To Fix SADL_GW_DT_SB_UI015 - Entity sets &1 and &2 have the same entity type &3. MEST is not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_GW_DT_SB_UI - Gateway Service Builder UI Integration for SADL

• Message number: 015

• Message text: Entity sets &1 and &2 have the same entity type &3. MEST is not allowed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_GW_DT_SB_UI015 - Entity sets &1 and &2 have the same entity type &3. MEST is not allowed ?

  The SAP error message SADL_GW_DT_SB_UI015 indicates that there is a conflict in the definition of entity sets in your SAP Gateway service. Specifically, it states that two entity sets (denoted as &1 and &2) are using the same entity type (denoted as &3), which is not allowed in the context of the Model-Driven Service Layer (MEST).
  Cause:
  This error typically arises when:
  
  Duplicate Entity Types: You have defined multiple entity sets that reference the same entity type in a way that is not permissible. In OData services, each entity set must be uniquely identifiable.
  Model Configuration Issues: There may be a misconfiguration in the service definition or the underlying data model that leads to this conflict.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Entity Set Definitions:
  
  Go to the service definition in the SAP Gateway Service Builder (transaction code SEGW).
  Review the entity sets defined in your service and ensure that no two entity sets are referencing the same entity type in a conflicting manner.
  
  
  
  Rename or Remove Duplicates:
  
  If you find that two entity sets are indeed using the same entity type, consider renaming one of the entity sets or removing the duplicate if it is not needed.
  
  
  
  Adjust the Data Model:
  
  If the entity sets are intended to represent different aspects of the same entity type, consider creating a new entity type that can encapsulate the differences, and then create separate entity sets for each.
  
  
  
  Regenerate the Service:
  
  After making changes, regenerate the service and check if the error persists. You can do this by right-clicking on the service in the Service Builder and selecting "Generate".
  
  
  
  Test the Service:
  
  Once the changes are made, test the OData service to ensure that it is functioning correctly without the error.
  
  
  
  Related Information:
  
  SAP Gateway: The SAP Gateway is a technology that allows you to connect devices, environments, and applications to SAP systems. Understanding how entity types and entity sets work in OData services is crucial for effective service design.
  OData Protocol: Familiarize yourself with the OData protocol, as it defines how to create and consume RESTful APIs. Understanding the structure of entity types and sets will help prevent similar issues in the future.
  SAP Notes and Documentation: Check SAP Notes and the official SAP documentation for any updates or specific guidelines related to the error message SADL_GW_DT_SB_UI015.
  
  By following these steps, you should be able to resolve the error and ensure that your OData service is correctly configured.