How To Fix SPXN204 - Communication type of implementation doesn't match with contract

SAP Error Message - Details

• Message type: E = Error

• Message class: SPXN - Proxy Generation

• Message number: 204

• Message text: Communication type of implementation doesn't match with contract

What causes this issue?

For contract operations with communication type 'WebService via Event',
an Event Provider has to be assigned. For communication type
'WebService', a Service Consumer (or Service Group or Consumer Mapping)
has to be assigned.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SPXN204 - Communication type of implementation doesn't match with contract ?

  The SAP error message SPXN204 indicates that there is a mismatch between the communication type defined in the implementation and the contract in the context of SAP's Service-Oriented Architecture (SOA) or Enterprise Services. This typically occurs when the service implementation does not align with the expected communication type specified in the service contract.
  Cause:
  
  Mismatch in Communication Type: The implementation of the service may be set to a different communication type (e.g., synchronous vs. asynchronous) than what is defined in the service contract.
  Incorrect Configuration: The service interface or the implementation might not be correctly configured in the SAP system.
  Versioning Issues: If there are multiple versions of the service, the implementation might be pointing to an outdated or incorrect version of the contract.
  Transport Layer Issues: Sometimes, issues in the transport layer or middleware can lead to discrepancies in communication types.
  
  Solution:
  
  Check the Service Contract: Review the service contract to confirm the expected communication type (synchronous or asynchronous).
  Review Implementation: Ensure that the implementation of the service matches the communication type defined in the contract. If it is supposed to be synchronous, ensure that the implementation is set up to handle synchronous calls.
  Adjust Configuration: If there is a mismatch, adjust the configuration of the service implementation to align with the contract. This may involve changing settings in the SAP NetWeaver Administrator or the relevant transaction codes.
  Regenerate Service: If changes were made to the service contract, regenerate the service implementation to ensure that it reflects the latest contract definitions.
  Check for Version Conflicts: Ensure that you are using the correct version of the service and that there are no conflicts with other versions.
  Test the Service: After making the necessary adjustments, test the service to ensure that it is functioning correctly and that the error no longer occurs.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for more details on service implementation and contracts.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SOAMANAGER for managing web services and service definitions.
  SAP Community: Engage with the SAP Community forums for insights and solutions from other users who may have encountered similar issues.
  Debugging Tools: Utilize debugging tools within SAP to trace the execution of the service and identify where the mismatch occurs.
  
  By following these steps, you should be able to resolve the SPXN204 error and ensure that your service implementation aligns with the defined contract.