How To Fix CNV_DMC_MC090 - The top level of the object list is already being displayed

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_MC - Migration Object Modeler

• Message number: 090

• Message text: The top level of the object list is already being displayed

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 CNV_DMC_MC090 - The top level of the object list is already being displayed ?

  The SAP error message CNV_DMC_MC090 typically occurs in the context of data migration or conversion processes, particularly when using the SAP Data Migration Cockpit (DMC) or related tools. This error indicates that the system is trying to display or process an object list that is already being displayed, which can lead to conflicts or inconsistencies in the user interface.
  Cause:
  
  Concurrent Operations: The error often arises when a user attempts to open or display an object list that is already open in another session or window.
  Session Management: If multiple sessions are trying to access the same object list, it can lead to this error.
  User Interface Issues: Sometimes, the user interface may not refresh properly, leading to the system thinking that the object list is still being displayed.
  
  Solution:
  
  Close Duplicate Sessions: Check if there are multiple sessions or windows open that are trying to access the same object list. Close any duplicates.
  Refresh the Interface: Try refreshing the screen or navigating away and back to the object list to reset the display.
  Log Out and Log In: If the issue persists, logging out of the SAP system and logging back in can help reset the session state.
  Check for Locks: Ensure that there are no locks on the object list that might be preventing it from being displayed. You can use transaction codes like SM12 to check for locks.
  Consult Documentation: Review the SAP documentation or notes related to the specific version of the Data Migration Cockpit you are using, as there may be known issues or patches available.
  Contact SAP Support: If none of the above solutions work, consider reaching out to SAP support for further assistance, especially if this is a recurring issue.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12 (to check for locks), SM21 (to view system logs), and ST22 (to check for dumps).
  SAP Notes: Search for SAP Notes related to the error message or the Data Migration Cockpit for any specific fixes or updates.
  User Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to resolve the CNV_DMC_MC090 error and continue with your data migration tasks.