How To Fix SADL_RAP_OPXY_EDMX058 - Entity Set &1 : Navigation property (&2) has no cardinality

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_RAP_OPXY_EDMX - RESTful ABAP Odata Proxy Support

• Message number: 058

• Message text: Entity Set &1 : Navigation property (&2) has no cardinality

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_RAP_OPXY_EDMX058 - Entity Set &1 : Navigation property (&2) has no cardinality ?

  The SAP error message SADL_RAP_OPXY_EDMX058 typically occurs in the context of the SAP RAP (Rapid Application Programming) model when there is an issue with the definition of an entity set and its navigation properties in the OData service. This error indicates that a navigation property defined in the entity set does not have a specified cardinality, which is essential for the OData service to understand the relationship between entities.
  Cause:
  
  Missing Cardinality Definition: The navigation property in the entity definition does not have a cardinality defined. Cardinality specifies how many instances of one entity can be associated with instances of another entity (e.g., one-to-one, one-to-many, many-to-many).
  Model Definition Issues: There may be issues in the underlying data model or the way the entities and their relationships are defined in the CDS (Core Data Services) views.
  Inconsistent Metadata: The metadata for the OData service may not be consistent with the underlying data model, leading to confusion about how entities relate to one another.
  
  Solution:
  
  
  Check Entity Definitions: Review the CDS views or the entity definitions in your RAP model. Ensure that all navigation properties have a defined cardinality. For example, if you have a navigation property from EntityA to EntityB, you should specify whether it is 1:1, 1:n, or n:m.
  Example:
  define root view entity EntityA
  as select from ...
  {
      key field1,
      field2,
      ...
      association to EntityB as _EntityB on ...
  }
  
  
  Update Metadata: If you have made changes to the entity definitions, ensure that you regenerate the metadata for the OData service. This can often be done through the transaction /IWFND/MAINT_SERVICE or by using the relevant tools in your development environment.
  
  
  Check for Annotations: Ensure that any necessary annotations related to cardinality are correctly defined in your CDS views. Annotations can provide additional context for how entities relate to one another.
  
  
  Test the OData Service: After making changes, test the OData service to ensure that the error is resolved. You can use tools like Postman or the SAP Gateway Client to test the service.
  
  
  Consult Documentation: If you are unsure about how to define cardinality or associations, refer to the SAP documentation on RAP and OData services for guidance on best practices.
  
  
  Related Information:
  
  SAP RAP Documentation: Review the official SAP documentation on the RAP model for detailed information on entity definitions, associations, and cardinality.
  OData Services: Familiarize yourself with OData concepts, especially regarding entity relationships and navigation properties.
  SAP Community: Engage with the SAP Community forums for insights and solutions from other developers who may have encountered similar issues.
  
  By addressing the cardinality definition and ensuring consistency in your model, you should be able to resolve the SADL_RAP_OPXY_EDMX058 error.