How To Fix /SSB/CORE855 - No Odata service is marked as main service in annotation model

SAP Error Message - Details

• Message type: E = Error

• Message class: /SSB/CORE -

• Message number: 855

• Message text: No Odata service is marked as main service in annotation model

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SSB/CORE855 - No Odata service is marked as main service in annotation model ?

  The SAP error message /SSB/CORE855 No OData service is marked as main service in annotation model typically occurs in the context of SAP Gateway and OData services, particularly when working with SAP Fiori applications or when trying to expose an OData service.
  Cause:
  This error indicates that the OData service you are trying to use does not have a designated "main service" in its annotation model. In the context of OData, a main service is usually the primary service that should be called when accessing the data model. If no service is marked as the main service, the system cannot determine which service to use, leading to this error.
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check the Annotation Model:
  
  Open the annotation model associated with your OData service.
  Ensure that at least one OData service is marked as the main service. This is typically done in the service definition or metadata.
  
  
  
  Mark a Service as Main:
  
  In the annotation model, you can specify which service should be the main service. This is usually done by setting a specific property or flag in the service definition.
  If you are using SAP Web IDE or another development environment, look for options to set the main service in the service configuration.
  
  
  
  Regenerate the OData Service:
  
  After making changes to the annotation model, regenerate the OData service to ensure that the changes take effect.
  You can do this through transaction /IWFND/MAINT_SERVICE in the SAP GUI, where you can activate and maintain your OData services.
  
  
  
  Test the Service:
  
  After marking a service as the main service and regenerating it, test the OData service again to see if the error persists.
  
  
  
  Check for Dependencies:
  
  Ensure that there are no other issues with the OData service, such as missing dependencies or incorrect configurations.
  
  
  
  Related Information:
  
  SAP Gateway: This is the technology that allows you to expose your SAP data and business logic as OData services.
  OData Services: These are RESTful services that allow for CRUD operations on data entities.
  SAP Fiori: A user experience (UX) design approach that uses OData services to provide a modern interface for SAP applications.
  Transaction Codes:
  
  /IWFND/MAINT_SERVICE: To maintain OData services.
  /IWFND/ERROR_LOG: To check for any errors related to OData services.
  
  
  
  If you continue to experience issues after following these steps, consider checking SAP Notes or reaching out to SAP support for further assistance.