How To Fix CFD_GW_UI012 - Exactly one custom field expected

SAP Error Message - Details

• Message type: E = Error

• Message class: CFD_GW_UI - TechnicalMessages for Custom Field Maintenance oData Service

• Message number: 012

• Message text: Exactly one custom field expected

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CFD_GW_UI012 - Exactly one custom field expected ?

  The SAP error message CFD_GW_UI012, which states "Exactly one custom field expected," typically occurs in the context of SAP Fiori applications or when working with custom fields in the SAP Cloud Platform. This error indicates that the system expected exactly one custom field to be provided, but either none or more than one was found.
  Cause:
  
  Incorrect Configuration: The custom fields may not be configured correctly in the backend system or in the Fiori app.
  Multiple Custom Fields: The application might be trying to process multiple custom fields when it is only designed to handle one.
  Data Model Issues: There may be issues with the data model where the expected structure does not match the actual data being sent or received.
  API Misconfiguration: If you are using an OData service, the service might be misconfigured to return multiple custom fields instead of a single one.
  
  Solution:
  
  
  Check Custom Field Configuration:
  
  Go to the Custom Fields and Logic app in the SAP Fiori launchpad.
  Verify that the custom fields are defined correctly and that only one field is marked as required if that is the expectation.
  
  
  
  Review the Fiori App Configuration:
  
  Ensure that the Fiori app is configured to handle the expected custom field correctly.
  Check the app's settings to confirm that it is set up to expect only one custom field.
  
  
  
  Inspect the OData Service:
  
  If you are using an OData service, check the service definition to ensure that it is set up to return only one custom field.
  Use tools like SAP Gateway Client (Transaction /IWFND/GW_CLIENT) to test the OData service and see the response structure.
  
  
  
  Debugging:
  
  If you have access to the backend, consider debugging the application to see where the error is being triggered.
  Look for any logic that processes custom fields and ensure it aligns with the expected input.
  
  
  
  Consult Documentation:
  
  Review the SAP documentation related to custom fields and the specific Fiori app you are using to ensure compliance with expected configurations.
  
  
  
  SAP Notes and Support:
  
  Check for any relevant SAP Notes that might address this specific error or provide guidance on configuration.
  If the issue persists, consider reaching out to SAP Support for assistance.
  
  
  
  Related Information:
  
  Custom Fields and Logic: This is a feature in SAP that allows users to create custom fields in standard applications without modifying the underlying code.
  SAP Fiori: A user experience (UX) design approach that provides a consistent and intuitive interface across SAP applications.
  OData Services: A standard protocol used to create and consume RESTful APIs, commonly used in SAP applications for data exchange.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.