How To Fix /IWFND/CM_DESIGNTIME162 - No key defined in mapping model

/IWFND/CM_DESIGNTIME162 - Overview

• Message type: E = Error

• Message class: /IWFND/CM_DESIGNTIME -

• Message number: 162

• Message text: No key defined in mapping model

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.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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/IWFND/CM_DESIGNTIME162 - Details

• The SAP error message /IWFND/CM_DESIGNTIME162 No key defined in mapping model typically occurs in the context of SAP Gateway and OData services. This error indicates that there is an issue with the mapping model of the OData service, specifically that a key has not been defined for the entity type in the mapping model.
  
  Cause:
  
  Missing Key Definition: The entity type in the OData service does not have a key defined. In OData, each entity must have a unique identifier (key) to distinguish it from other entities.
  Incorrect Mapping: The mapping between the data model and the OData service might not be correctly configured, leading to the absence of a key.
  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:
  
  
  Define a Key:
  
  Go to the Data Model in the SAP Gateway Service Builder (transaction code SEGW).
  Locate the