How To Fix FDT_DEPLOYMENT121 - Incompatible element &1: Different compound object

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_DEPLOYMENT - Messages for deployment

• Message number: 121

• Message text: Incompatible element &1: Different compound object

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 FDT_DEPLOYMENT121 - Incompatible element &1: Different compound object ?

  The SAP error message FDT_DEPLOYMENT121 indicates that there is an issue with the deployment of a field or element in the context of SAP Fiori or SAP UI5 applications. Specifically, the error message states that there is an "Incompatible element" due to a "Different compound object." This typically occurs when there is a mismatch between the expected structure of a data model and the actual structure being deployed.
  Cause:
  
  Mismatch in Data Model: The error often arises when the data model defined in the application does not match the data model in the backend system. This can happen if there have been changes to the data model in the backend that have not been reflected in the frontend application.
  Versioning Issues: If different versions of the same object are being used, it can lead to incompatibility.
  Deployment Issues: Sometimes, the deployment process may not have completed successfully, leading to inconsistencies in the deployed objects.
  Configuration Errors: Incorrect configuration settings in the application or the backend can also lead to this error.
  
  Solution:
  
  Check Data Model Consistency: Ensure that the data model in the frontend application matches the backend data model. This may involve checking the definitions of the fields and their types.
  Re-deploy the Application: If there were any changes made to the data model, re-deploy the application to ensure that the latest version is being used.
  Clear Cache: Clear the cache of the application and the browser to ensure that no old versions of the application are being used.
  Check for Updates: Ensure that both the frontend and backend systems are updated to the latest versions, as updates may resolve compatibility issues.
  Review Configuration: Double-check the configuration settings in both the frontend and backend to ensure they are correctly set up.
  Consult Documentation: Refer to SAP documentation or notes related to the specific version of the application you are using for any known issues or additional troubleshooting steps.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues related to the error message FDT_DEPLOYMENT121. SAP frequently updates their knowledge base with solutions to common problems.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Debugging Tools: Utilize SAP debugging tools to trace the deployment process and identify where the incompatibility arises.
  
  If the issue persists after trying the above solutions, it may be necessary to involve SAP support for further assistance.