How To Fix SIW046 - Structure &1 has no fields that are used in service

SAP Error Message - Details

• Message type: E = Error

• Message class: SIW - Service Implementation Workbench

• Message number: 046

• Message text: Structure &1 has no fields that are used in service

What causes this issue?

This message can result from the following reasons:
1. You have created a project for a bidirectional service but the API
signature has either IMPORTING parameters only, EXPORTING parameters
only or no parameter at all.
2. All members of the API structure which represents the API signature
in the mapping section have been disabled, either in the Response or in
the Request message (or both).

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

For common services it is not possible to have an empty API structure,
at least one field of the structure has to be used.

System Response

The system terminates the mapping process.

How to fix this error?

Review the fields and select the
<DS:DE.SIW_DTE_IS_EXPOSED>Use In Service</> checkbox for at least one
field of the structure.
Note:
If you are about to generate a service of type Action you (which means
no API parameters at all), Get (only EXPORTING parameters) or Notify
(only IMPORTING parameters) this message just serves as reminder to
check the correctness of the mapping.
You may have an empty API structure in the following cases:
Request: When you create a Get service
Response: When you create Notify service
Both: When you create an Action service

Procedure for System Administrators

Additional Hints
Within the SIW transaction, you can navigate from the displayed log
dialog to the erroneous mapping node. When you double-click the log
message, the system opens the corresponding detail screen and leaves the
log open. This enables you to correct the incorrect mapping entries
right away. To update the log messages, click the Mapping Check
pushbutton again.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SIW046 - Structure &1 has no fields that are used in service ?

  The SAP error message SIW046 indicates that a structure (denoted as &1 in the message) does not contain any fields that are utilized in the service you are trying to work with. This typically occurs in the context of SAP's Integration Framework or when working with service definitions in SAP Gateway or similar environments.
  Cause:
  
  Empty Structure: The structure defined in the service does not have any fields defined, which means there is nothing to map or use in the service.
  Incorrect Mapping: The fields that are expected to be used in the service might not be correctly mapped or defined in the service definition.
  Service Definition Issues: The service might be incorrectly defined or not properly activated, leading to the system not recognizing any fields in the structure.
  
  Solution:
  
  
  Check Structure Definition:
  
  Go to the Data Dictionary (transaction SE11) and check the structure defined as &1. Ensure that it has fields defined.
  If the structure is empty, you will need to add the necessary fields that are required for your service.
  
  
  
  Review Service Definition:
  
  If you are using SAP Gateway, check the service definition in transaction SEGW (Gateway Service Builder).
  Ensure that the structure is correctly associated with the entity type and that the fields are properly mapped.
  
  
  
  Activate the Service:
  
  After making changes to the structure or service definition, ensure that you activate the service again. This can be done in the Gateway Service Builder (SEGW) by selecting the service and choosing the "Activate" option.
  
  
  
  Check for Dependencies:
  
  Ensure that there are no dependencies or references to other structures or tables that might be causing the issue. Sometimes, changes in related objects can affect the service.
  
  
  
  Testing:
  
  After making the necessary changes, test the service again to see if the error persists. You can use transaction /IWFND/GW_CLIENT to test the OData service.
  
  
  
  Related Information:
  
  Transaction Codes:
  
  SE11: Data Dictionary
  SEGW: Gateway Service Builder
  /IWFND/GW_CLIENT: OData Client for testing services
  
  
  Documentation: Refer to SAP Help documentation for more details on service definitions and structures in SAP Gateway.
  SAP Notes: Check for any relevant SAP Notes that might address specific issues related to this error message.
  
  By following these steps, you should be able to resolve the SIW046 error and ensure that your service is correctly utilizing the defined structure.