How To Fix /UI5/MP_CP_APP004 - Changing parameter &1 is not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: /UI5/MP_CP_APP -

• Message number: 004

• Message text: Changing parameter &1 is not allowed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /UI5/MP_CP_APP004 - Changing parameter &1 is not allowed ?

  The SAP error message /UI5/MP_CP_APP004 Changing parameter &1 is not allowed typically occurs in the context of SAP Fiori applications or UI5 applications when there is an attempt to modify a parameter that is not permitted. This can happen for various reasons, often related to the configuration of the application or the way parameters are being handled in the application logic.
  Cause:
  
  Immutable Parameters: The parameter you are trying to change is defined as immutable in the application configuration. This means that once it is set, it cannot be modified during the application's lifecycle.
  Incorrect Binding: The parameter may be bound to a model or a service that does not allow changes to that specific parameter.
  Application Logic: The application may have specific logic that restricts changes to certain parameters based on the current state of the application or user permissions.
  Versioning Issues: If there are discrepancies between the versions of the UI5 libraries or the backend services, it may lead to unexpected behavior, including restrictions on parameter changes.
  
  Solution:
  
  Review Application Configuration: Check the application configuration to see if the parameter is indeed marked as immutable. If it is, you will need to find an alternative way to achieve your goal without changing this parameter.
  Check Binding Logic: Ensure that the binding of the parameter is correct and that it is not being modified in a way that is not allowed. Review the model and the data being passed to ensure compliance with the expected structure.
  Modify Application Logic: If you have access to the application code, review the logic that handles the parameter. You may need to adjust the code to allow for changes or to handle the parameter differently.
  Consult Documentation: Refer to the official SAP documentation for the specific Fiori/UI5 application you are working with. There may be guidelines or best practices regarding parameter handling.
  Check for Updates: Ensure that you are using the latest version of the UI5 libraries and that your backend services are also up to date. Sometimes, bugs or issues are resolved in newer versions.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues related to this error message. SAP frequently updates their knowledge base with solutions to common problems.
  Community Forums: Engage with the SAP Community or forums like SAP Community Network (SCN) to see if other users have encountered and resolved similar issues.
  Debugging: If you have access to the development tools, use debugging to trace the execution flow and identify where the parameter change is being attempted and why it is being blocked.
  
  By following these steps, you should be able to identify the cause of the error and implement a suitable solution.