How To Fix /IWBEP/CM_V4_MED318 - Setting entity delta status property not supported for key property '&1'

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 318

• Message text: Setting entity delta status property not supported for key property '&1'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_MED318 - Setting entity delta status property not supported for key property '&1' ?

  The SAP error message /IWBEP/CM_V4_MED318 indicates that there is an issue with setting the entity delta status property for a specific key property in an OData service. This error typically arises in the context of SAP Gateway and OData services when there is an attempt to manipulate or access the delta status of an entity that does not support it.
  Cause:
  
  Unsupported Key Property: The key property specified in the error message (&1) is not configured to support delta tracking. Delta tracking is a feature that allows clients to retrieve only the changes made to the data since the last request.
  Entity Set Configuration: The entity set may not be properly configured to support delta queries. This can happen if the entity set does not have a proper key defined or if the key is not marked as a key property in the metadata.
  Service Implementation: The implementation of the OData service may not correctly handle the delta status for the specified entity.
  
  Solution:
  
  Check Key Property Configuration: Ensure that the key property specified in the error message is correctly defined in the OData service metadata. It should be marked as a key property in the entity type definition.
  Review Entity Set Settings: Verify that the entity set is configured to support delta queries. This can be done in the service definition in the SAP Gateway.
  Implement Delta Handling: If the entity is supposed to support delta tracking, ensure that the necessary logic is implemented in the service to handle delta requests. This may involve implementing the GET method for the $delta query option.
  Check Service Registration: Ensure that the OData service is properly registered and activated in the SAP Gateway. Sometimes, reactivating the service can resolve issues related to metadata.
  Debugging: Use transaction /IWFND/ERROR_LOG to check for additional error messages or logs that might provide more context about the issue.
  
  Related Information:
  
  OData Services: Understanding how OData services work in SAP Gateway, including the concepts of entity sets, key properties, and delta queries.
  SAP Gateway Configuration: Familiarize yourself with the configuration settings in the SAP Gateway that pertain to OData services, including service registration and metadata management.
  SAP Notes: Check for any relevant SAP Notes that might address known issues or provide patches related to this error message.
  
  If the issue persists after following these steps, consider reaching out to SAP support or consulting the SAP community for further assistance.