How To Fix /IWBEP/CM_V4_RUNTIME100 - Navigation property has wrong multiplicity for the new message target

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_RUNTIME -

• Message number: 100

• Message text: Navigation property has wrong multiplicity for the new message target

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_RUNTIME100 - Navigation property has wrong multiplicity for the new message target ?

  The SAP error message /IWBEP/CM_V4_RUNTIME100 indicates that there is an issue with the navigation property in an OData service. Specifically, it suggests that the multiplicity of the navigation property does not match the expected configuration for the target entity. This typically occurs when the OData model is not correctly defined, leading to inconsistencies in how entities relate to one another.
  Cause
  The error can arise from several scenarios, including:
  
  Incorrect Model Definition: The navigation property in the OData model may be defined with the wrong multiplicity (e.g., one-to-many vs. many-to-one).
  Mismatch in Entity Relationships: The relationships between entities in the data model may not align with the definitions in the OData service.
  Changes in Data Model: If there have been recent changes to the underlying data model (like adding or modifying relationships), the OData service may not have been updated accordingly.
  Service Metadata Issues: The service metadata might not reflect the current state of the model, leading to discrepancies.
  
  Solution
  To resolve this error, you can follow these steps:
  
  
  Check the OData Model: Review the definitions of the entities and their relationships in the OData model. Ensure that the multiplicity of the navigation properties is correctly defined.
  
  For example, if you have a navigation property that should represent a one-to-many relationship, ensure it is defined as such in the model.
  
  
  
  Update the Service: If you have made changes to the underlying data model, regenerate the OData service to ensure that the service reflects the current state of the model.
  
  You can do this by using transaction code /IWFND/MAINT_SERVICE to maintain and activate the OData service.
  
  
  
  Check Metadata: Access the service metadata (usually available at the URL http://<host>:<port>/sap/opu/odata/sap/<service_name>/$metadata) and verify that the navigation properties and their multiplicities are correctly defined.
  
  
  Test the Service: After making the necessary adjustments, test the OData service again to see if the error persists.
  
  
  Debugging: If the issue continues, consider using debugging tools to trace the request and response, which may provide additional insights into where the mismatch is occurring.
  
  
  Related Information
  
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide guidance on similar errors.
  OData Documentation: Review the official SAP OData documentation for best practices in defining entity relationships and navigation properties.
  Community Forums: Engage with the SAP Community or forums where other developers may have encountered and resolved similar issues.
  
  By following these steps, you should be able to identify and correct the cause of the /IWBEP/CM_V4_RUNTIME100 error in your SAP OData service.