How To Fix /IWBEP/CM_V4_MED078 - Entity type '&1' has an invalid key definition

/IWBEP/CM_V4_MED078 - Overview

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 078

• Message text: Entity type '&1' has an invalid key definition

Self-Explanatory Message

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/IWBEP/CM_V4_MED078 - Details

• The SAP error message /IWBEP/CM_V4_MED078 indicates that there is an issue with the key definition of an entity type in an OData service. This error typically arises when the key properties defined for an entity type do not match the expected structure or are not properly configured.
  
  Cause:
  
  Invalid Key Definition: The entity type specified in the error message has a key that is either missing, incorrectly defined, or does not correspond to the properties available in the entity.
  Missing Key Properties: The key properties that are supposed to uniquely identify an instance of the entity type are not defined in the metadata.
  Incorrect Annotations: There may be issues with the annotations in the service definition that lead to the incorrect interpretation of the key properties.
  Model Changes: If there have been recent changes to the underlying data model (like adding or removing fields), the OData service may not have been updated accordingly.
  
  
  Solution:
  
  Check Entity Type