How To Fix /IWFND/CM_MGW_RT119 - Data object '&1' has no key field assigned

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_MGW_RT -

• Message number: 119

• Message text: Data object '&1' has no key field assigned

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWFND/CM_MGW_RT119 - Data object '&1' has no key field assigned ?

  The SAP error message /IWFND/CM_MGW_RT119 indicates that a data object in your OData service does not have a key field assigned. This is a common issue when defining OData services in SAP Gateway, and it typically arises when the service is unable to uniquely identify instances of the data object.
  Cause:
  
  Missing Key Field: The data object (entity) in your OData model does not have a key field defined. Every entity in an OData service must have at least one key field to uniquely identify each instance of that entity.
  Incorrect Model Definition: The data model may not be correctly defined in the service implementation or the metadata.
  Data Source Issues: If the data source (like a database table or view) does not have a primary key defined, it can lead to this error.
  
  Solution:
  
  
  Define Key Fields:
  
  Go to the Data Model in your OData service definition.
  Ensure that each entity has at least one key field defined. You can do this in the SAP Gateway Service Builder (transaction code SEGW).
  Right-click on the entity and select "Properties" to define the key fields.
  
  
  
  Check Data Source:
  
  If your entity is based on a database table or view, ensure that the underlying data source has a primary key defined.
  If it does not, you may need to create a view that includes a unique identifier or modify the existing table to include a primary key.
  
  
  
  Regenerate the Service:
  
  After making changes to the key fields, regenerate the OData service.
  Use the "Generate Runtime Objects" option in the Service Builder to ensure that the changes are reflected in the service.
  
  
  
  Test the Service:
  
  After making the necessary changes, test the OData service using the SAP Gateway Client (transaction code /IWFND/GW_CLIENT) or any other OData client to ensure that the error is resolved.
  
  
  
  Related Information:
  
  OData Services: OData services in SAP are used to expose data in a standardized way, allowing for easy integration with various applications.
  Entity Types: In OData, an entity type represents a data structure that can be queried and manipulated. Each entity type should have a unique identifier (key).
  SAP Gateway: SAP Gateway is a technology that enables the connection of devices, environments, and platforms to SAP systems.
  
  If you continue to experience issues after following these steps, consider checking the SAP Community or SAP Notes for any specific patches or updates related to your version of SAP Gateway.