How To Fix /UI5/MP_CA_APP009 - DataSource with id &1 already exists in base descriptor

SAP Error Message - Details

• Message type: E = Error

• Message class: /UI5/MP_CA_APP -

• Message number: 009

• Message text: DataSource with id &1 already exists in base descriptor

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 /UI5/MP_CA_APP009 - DataSource with id &1 already exists in base descriptor ?

  The SAP error message /UI5/MP_CA_APP009 DataSource with id &1 already exists in base descriptor typically occurs in the context of SAP Fiori or SAPUI5 applications when there is an attempt to register a data source that has already been defined in the base descriptor. This can happen during the development or deployment of applications that utilize the SAP Gateway or OData services.
  Cause:
  
  
  Duplicate Data Source Registration: The error indicates that there is an attempt to register a data source with an ID that already exists in the base descriptor. This can happen if:
  
  The same data source is defined multiple times in the application descriptor files (e.g., manifest.json).
  There are conflicting definitions in different components or modules of the application.
  The application is being redeployed without proper cleanup of previous versions.
  
  
  
  Caching Issues: Sometimes, caching mechanisms may cause the system to retain old definitions, leading to conflicts when new definitions are introduced.
  
  
  Solution:
  
  
  Check for Duplicates: Review the manifest.json file and any other relevant configuration files to ensure that the data source with the specified ID is not defined more than once. Remove any duplicate entries.
  
  
  Clear Cache: If you suspect that caching is causing the issue, clear the cache of the SAP Gateway or the browser cache if you are testing in a web environment. You can also use the transaction code /IWFND/CACHE_CLEANUP in the SAP GUI to clear the OData cache.
  
  
  Re-deploy the Application: If you are working in a development environment, try to re-deploy the application after ensuring that there are no duplicate data sources. This can help refresh the application state.
  
  
  Check for Dependencies: If your application is dependent on other components or libraries, ensure that there are no conflicting definitions in those components.
  
  
  Consult Documentation: If the issue persists, refer to the official SAP documentation or community forums for any updates or patches that may address this specific error.
  
  
  Related Information:
  
  SAP Fiori and SAPUI5 Documentation: Review the official SAP documentation for guidelines on defining data sources and managing application descriptors.
  SAP Community: Engage with the SAP Community forums where other developers may have encountered similar issues and can provide insights or solutions.
  SAP Notes: Check for any relevant SAP Notes that may address this error or provide additional troubleshooting steps.
  
  By following these steps, you should be able to resolve the error and successfully register your data source in the application.