How To Fix /IWBEP/CM_V4_MED064 - Entity type '&1' does not have a key

/IWBEP/CM_V4_MED064 - Overview

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 064

• Message text: Entity type '&1' does not have a key

Self-Explanatory Message

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/IWBEP/CM_V4_MED064 - Details

• The SAP error message /IWBEP/CM_V4_MED064 indicates that the entity type specified (represented by &1) does not have a key defined. This is a common issue when working with OData services in SAP Gateway, where each entity type must have a key to uniquely identify its instances.
  
  Cause:
  
  Missing Key Definition: The entity type in the data model does not have a key defined. In OData, every entity type must have at least one key property.
  Incorrect Metadata: The metadata for the OData service may not be correctly defined or may not have been updated after changes were made to the data model.
  Model 
  Configuration Issues: There may be issues in the configuration of the data model or the service implementation that prevent the key from being recognized.
  
  
  Solution:
  
  
  Define a Key:
  
  Go to the Data Model in the SAP Gateway Service Builder (transaction code SEGW).
  Locate the entity type that is causing the error.
  Ensure that at least one