How To Fix /UI2/INTEROP020 - Parameter &1 of function import &2 is obligatory but not supplied

SAP Error Message - Details

• Message type: E = Error

• Message class: /UI2/INTEROP -

• Message number: 020

• Message text: Parameter &1 of function import &2 is obligatory but not supplied

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /UI2/INTEROP020 - Parameter &1 of function import &2 is obligatory but not supplied ?

  The SAP error message /UI2/INTEROP020 indicates that a required parameter for a function import in an OData service is missing. This typically occurs when a client application (like an SAP Fiori app) tries to call an OData service but does not provide all the necessary parameters that the service expects.
  Cause:
  
  Missing Parameter: The error specifically states that a parameter (denoted as &1) for a function import (denoted as &2) is obligatory but has not been supplied in the request.
  Incorrect Configuration: The OData service might be incorrectly configured, or the client application might not be sending the correct parameters.
  Client-Side Issues: The client application may have a bug or misconfiguration that prevents it from sending the required parameters.
  
  Solution:
  
  Check the OData Service Documentation: Review the documentation for the OData service to identify the required parameters for the function import. Ensure that you are providing all mandatory parameters in your request.
  Debug the Client Application: If you have access to the client application code, debug it to ensure that it is correctly constructing the request and including all required parameters.
  Use a Tool to Test the OData Service: Use tools like Postman or SAP Gateway Client (Transaction /IWFND/GW_CLIENT) to manually test the OData service. This can help you identify if the issue is with the service itself or the client application.
  Check for Updates: Ensure that both the SAP system and the client application are up to date. Sometimes, updates can resolve issues related to parameter handling.
  Consult SAP Notes: Look for any relevant SAP Notes that might address this specific error or provide guidance on similar issues.
  
  Related Information:
  
  OData Services: Understand how OData services work in SAP, including the concept of function imports and their parameters.
  SAP Fiori Apps: If you are working with SAP Fiori applications, familiarize yourself with how they interact with OData services and the common issues that can arise.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and what solutions they found effective.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.