How To Fix /UI5/DTA021 - Mandatory URL parameter 'layer' missing or invalid

SAP Error Message - Details

• Message type: E = Error

• Message class: /UI5/DTA -

• Message number: 021

• Message text: Mandatory URL parameter 'layer' missing or invalid

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /UI5/DTA021 - Mandatory URL parameter 'layer' missing or invalid ?

  The SAP error message /UI5/DTA021 Mandatory URL parameter 'layer' missing or invalid typically occurs in the context of SAP Fiori applications or SAPUI5 applications when the application is trying to access a resource or service that requires a specific URL parameter named layer. This parameter is often used to define the layer of the application or the data being accessed, such as "base," "custom," or "test."
  Cause:
  
  Missing Parameter: The URL being accessed does not include the layer parameter, which is required for the application to function correctly.
  Invalid Parameter: The layer parameter is present but has an invalid value that the application does not recognize or support.
  Configuration Issues: There may be issues in the configuration of the application or the service that is being accessed, leading to the absence or misconfiguration of the layer parameter.
  Routing Issues: The routing configuration in the application may not be set up correctly, causing the application to not pass the required parameters.
  
  Solution:
  
  
  Check the URL: Ensure that the URL you are using to access the application includes the layer parameter. For example, the URL should look something like this:
  /sap/bc/ui5_ui5/sap/your_app?layer=your_layer_value
  Replace your_layer_value with a valid layer value (e.g., "base," "custom").
  
  
  Validate Layer Value: If the layer parameter is present, check that its value is valid and recognized by the application. Refer to the application documentation or configuration to determine the acceptable values.
  
  
  Review Application Configuration: Check the configuration settings of the SAP Fiori or SAPUI5 application to ensure that the layer parameter is correctly defined and that the application is set up to handle it.
  
  
  Debugging: Use browser developer tools to inspect the network requests and responses. This can help identify if the layer parameter is being sent correctly and if there are any other related errors.
  
  
  Consult Documentation: Refer to the official SAP documentation for the specific application or service you are using. There may be additional requirements or configurations needed for the layer parameter.
  
  
  Contact Support: If the issue persists after checking the above points, consider reaching out to SAP support or your internal IT support team for further assistance.
  
  
  Related Information:
  
  SAP Fiori and SAPUI5 Documentation: Check the official SAP documentation for guidelines on URL parameters and application configuration.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and to find potential solutions.
  Version Compatibility: Ensure that you are using a compatible version of SAP Fiori/SAPUI5 that supports the features you are trying to use.
  
  By following these steps, you should be able to resolve the error related to the missing or invalid layer parameter.