How To Fix /IWBEP/CM_SBMC_MPC018 - Left Entity type is not specified for association '&1'

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_SBMC_MPC -

• Message number: 018

• Message text: Left Entity type is not specified for association '&1'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_SBMC_MPC018 - Left Entity type is not specified for association '&1' ?

  The SAP error message /IWBEP/CM_SBMC_MPC018 Left Entity type is not specified for association '&1' typically occurs in the context of SAP Gateway and OData services when there is an issue with the definition of associations in the data model. This error indicates that the left entity type for a specified association is not defined correctly in the metadata.
  Cause:
  
  Missing Entity Type Definition: The left entity type for the specified association is not defined in the service's metadata.
  Incorrect Association Definition: The association might be incorrectly defined in the data model, leading to a mismatch between the entities.
  Modeling Errors: There could be errors in the way the OData model is defined, such as typos or incorrect references to entity types.
  Service Activation Issues: The OData service may not be activated properly, leading to incomplete metadata generation.
  
  Solution:
  
  
  Check Entity Type Definitions:
  
  Ensure that the left entity type for the association is defined in the data model. You can do this by checking the relevant CDS views or the data model in the SAP Gateway Service Builder (transaction code SEGW).
  
  
  
  Review Association Definitions:
  
  Go to the Service Builder and check the associations defined in your model. Make sure that the left entity type is correctly specified and that it exists in the model.
  
  
  
  Correct Any Typos:
  
  Look for any typographical errors in the entity type names or association names. Ensure that they match exactly with the definitions in the model.
  
  
  
  Regenerate the Service:
  
  After making any changes, regenerate the service and activate it again. This can be done in the Service Builder by right-clicking on the service and selecting "Generate".
  
  
  
  Check Metadata:
  
  After regenerating, check the metadata of the OData service (by accessing the service URL with $metadata) to ensure that the associations are correctly defined.
  
  
  
  Test the Service:
  
  Once the changes are made, test the OData service to ensure that the error is resolved.
  
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  SEGW - Service Builder for OData services.
  SE11 - Data Dictionary to check the underlying database tables and structures.
  SE80 - Object Navigator for checking the overall structure of the application.
  
  
  
  Documentation: 
  
  Refer to SAP Help documentation for OData services and the specific version of SAP Gateway you are using for more detailed information on modeling and associations.
  
  
  
  SAP Notes: 
  
  Check for any relevant SAP Notes that might address known issues or provide additional guidance on this error.
  
  
  
  By following these steps, you should be able to identify and resolve the issue causing the error message /IWBEP/CM_SBMC_MPC018 Left Entity type is not specified for association '&1'.