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

SAP Error Message - Details

• 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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWFND/CM_DESIGNTIME162 - No key defined in mapping model ?

  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 entity type that is causing the error.
  Ensure that a key property is defined for the entity. You can do this by right-clicking on the entity type and selecting "Properties" to add a key field.
  
  
  
  Check Mapping:
  
  Verify the mapping between the data model and the OData service. Ensure that the key fields in the data model are correctly mapped to the OData entity.
  If necessary, regenerate the service to ensure that the changes are reflected.
  
  
  
  Regenerate the Service:
  
  After making changes to the entity type or its properties, regenerate the OData service by right-clicking on the service in the Service Builder and selecting "Generate".
  
  
  
  Test the Service:
  
  After making the necessary changes, test the OData service using the SAP Gateway Client (transaction code /IWFND/GW_CLIENT) to ensure that the error is resolved.
  
  
  
  Related Information:
  
  OData Services: OData (Open Data Protocol) is a standard protocol for building and consuming RESTful APIs. In SAP, OData services are used to expose business data and operations.
  SAP Gateway: SAP Gateway is a technology that enables the connection of devices, environments, and platforms to SAP systems. It allows for the creation of OData services that can be consumed by various clients.
  Entity Types and Keys: In OData, an entity type represents a data structure, and keys are properties that uniquely identify instances of that entity type.
  
  If the issue persists after following these steps, it may be helpful to check the SAP Notes or consult with SAP support for further assistance.