How To Fix /UI5/APP_API166 - Service is not supported and won't be cached: &1&2&3&4

SAP Error Message - Details

• Message type: E = Error

• Message class: /UI5/APP_API -

• Message number: 166

• Message text: Service is not supported and won't be cached: &1&2&3&4

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /UI5/APP_API166 - Service is not supported and won't be cached: &1&2&3&4 ?

  The SAP error message /UI5/APP_API166 Service is not supported and won't be cached: &1&2&3&4 typically indicates that there is an issue with the service being accessed in an SAP Fiori application. This error can arise due to several reasons, and understanding the cause is essential for finding a solution.
  Causes:
  
  Service Not Registered: The OData service that the application is trying to access may not be registered in the SAP Gateway or may not be activated.
  Service Not Supported: The service might not support the required operations (like GET, POST, etc.) that the application is trying to perform.
  Authorization Issues: The user may not have the necessary authorizations to access the service.
  Incorrect Service URL: The URL being used to access the service may be incorrect or malformed.
  Backend Issues: There could be issues in the backend system that prevent the service from being executed properly.
  
  Solutions:
  
  
  Check Service Registration:
  
  Go to the SAP Gateway Service Builder (transaction code /IWFND/MAINT_SERVICE) and ensure that the service is registered and activated.
  If it is not listed, you may need to register it.
  
  
  
  Verify Service Support:
  
  Check the service metadata to ensure that it supports the operations required by your application. You can access the service metadata by appending $metadata to the service URL.
  
  
  
  Check Authorizations:
  
  Ensure that the user has the necessary roles and authorizations to access the service. You can check this in transaction code SU53 after attempting to access the service.
  
  
  
  Validate Service URL:
  
  Double-check the URL being used in the application to ensure it is correct. Look for typos or incorrect parameters.
  
  
  
  Review Backend Logs:
  
  Check the backend system logs (transaction code SLG1) for any errors or issues related to the service execution.
  
  
  
  Clear Cache:
  
  Sometimes, clearing the cache of the SAP Gateway can resolve issues. You can do this using transaction code /IWFND/CACHE.
  
  
  
  Check System Status:
  
  Ensure that the backend system is up and running and that there are no connectivity issues between the Fiori front-end server and the backend system.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  Fiori Launchpad Configuration: Ensure that the Fiori Launchpad is correctly configured to access the OData services.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.