How To Fix /IWBEP/CM_CP012 - Wrong method call: 2 ADD_... methods of the same resource node

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_CP -

• Message number: 012

• Message text: Wrong method call: 2 ADD_... methods of the same resource node

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_CP012 - Wrong method call: 2 ADD_... methods of the same resource node ?

  The SAP error message /IWBEP/CM_CP012 Wrong method call: 2 ADD_... methods of the same resource node typically occurs in the context of SAP Gateway and OData services. This error indicates that there are multiple ADD methods defined for the same resource node in your OData service, which is not allowed.
  Cause:
  
  Duplicate Method Definitions: The error arises when there are two or more ADD methods defined for the same entity type or resource node in your OData service implementation. This can happen if:
  
  The service definition has been incorrectly configured.
  There are multiple implementations of the same method in the service class.
  The service is trying to handle the same operation in different ways, leading to ambiguity.
  
  
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check Service Definition:
  
  Go to the Service Builder (transaction code SEGW) and check the entity type and its associated methods.
  Ensure that there is only one ADD method defined for each resource node.
  
  
  
  Review Implementation:
  
  In the implementation class (usually generated in the SEGW transaction), check the methods implemented for the entity set.
  Make sure that there is only one implementation for the ADD operation for the specific resource node.
  
  
  
  Remove Duplicates:
  
  If you find multiple ADD methods, remove or comment out the duplicates. Ensure that only one method is handling the ADD operation for that resource node.
  
  
  
  Regenerate the Service:
  
  After making changes, regenerate the service and activate it again. This can be done in the Service Builder by right-clicking on the service and selecting the appropriate options.
  
  
  
  Test the Service:
  
  After making the necessary changes, test the OData service to ensure that the error is resolved and that the ADD operation works as expected.
  
  
  
  Related Information:
  
  OData Services: OData (Open Data Protocol) is a standard protocol for building and consuming RESTful APIs. In SAP, OData services are often used to expose business data and operations.
  SAP Gateway: SAP Gateway is a technology that enables the connection of devices, environments, and platforms to SAP systems. It allows for the creation of OData services.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SEGW (Service Builder) for creating and managing OData services, and IWFND/MAINT_SERVICE for managing service registrations.
  
  By following these steps, you should be able to resolve the error and ensure that your OData service functions correctly.