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

/IWBEP/CM_MGW_RT119 - Overview

• Message type: E = Error

• Message class: /IWBEP/CM_MGW_RT -

• Message number: 119

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

Self-Explanatory Message

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/IWBEP/CM_MGW_RT119 - Details

• The SAP error message /IWBEP/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 metadata for the OData service is not correctly configured.
  
  Cause:
  
  Missing Key Field: The data object (entity) in question does not have a key field defined. In OData services, each entity must have a unique identifier (key) to allow for proper data retrieval and manipulation.
  Incorrect Data Model: The underlying data model may not have a primary key defined, or the key field is not properly mapped in the OData service.
  Model 
  Configuration Issues: There may be issues in the way the OData model is configured, such as missing annotations or incorrect settings in the service definition.
  
  
  Solution:
  
  
  Define Key Field:
  
  Go to the Data Model (e.g., in SEGW transaction).
  Open the entity type that is causing the error.
  Ensure