How To Fix /UI5/APP_API041 - Can't convert simple type to table

SAP Error Message - Details

• Message type: E = Error

• Message class: /UI5/APP_API -

• Message number: 041

• Message text: Can't convert simple type to table

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message /UI5/APP_API041 - Can't convert simple type to table ?

  The SAP error message /UI5/APP_API041 Can't convert simple type to table typically occurs in the context of SAP Fiori applications or when working with SAPUI5. This error indicates that there is an attempt to convert a simple data type (like a string or number) into a table format, which is not valid. Here’s a breakdown of the cause, potential solutions, and related information:
  Cause
  
  Data Type Mismatch: The error usually arises when the application expects a table (array of objects) but receives a simple data type instead. This can happen if the backend service is returning a single value instead of an array.
  Model Binding Issues: If the data model is incorrectly defined or bound, it may lead to this error. For example, if a property is expected to be an array but is defined as a simple type in the OData service.
  Incorrect OData Service Response: If the OData service is not returning the expected structure (e.g., returning a single object instead of an array), it can lead to this error.
  
  Solutions
  
  
  Check OData Service Response: Use tools like Postman or the browser's developer tools to inspect the response from the OData service. Ensure that the response structure matches what the UI5 application expects (i.e., an array for table bindings).
  
  
  Adjust Data Model: If the data model is incorrectly defined, adjust it to ensure that the properties are correctly set as arrays where necessary. This may involve modifying the OData service or the way the model is defined in the UI5 application.
  
  
  Modify Application Logic: If the application logic is attempting to convert a simple type to a table, modify the logic to handle the data correctly. For example, if you expect a single value but need to display it in a table, wrap it in an array.
  
  
  Error Handling: Implement error handling in your application to gracefully manage situations where the data does not match the expected format. This can help prevent the application from crashing and provide a better user experience.
  
  
  Debugging: Use debugging tools available in the SAP Web IDE or your development environment to trace where the error occurs. This can help identify the exact point in the code where the data type mismatch happens.
  
  
  Related Information
  
  SAPUI5 Documentation: Refer to the official SAPUI5 documentation for guidance on data binding and model definitions.
  OData Service Documentation: Review the OData service documentation to ensure that the service is designed to return the correct data types.
  SAP Community: Engage with the SAP Community forums for insights and solutions from other developers who may have encountered similar issues.
  
  By following these steps, you should be able to identify the root cause of the error and implement a suitable solution.