How To Fix DH850 - System error when requesting the list box data: Unknown signature

SAP Error Message - Details

• Message type: E = Error

• Message class: DH - DD: Messages for search helps

• Message number: 850

• Message text: System error when requesting the list box data: Unknown signature

What causes this issue?

A system error occurred in connection with list boxes.
The frontend requested data for a list box that is not known in the
backend.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

This error can only be corrected by SAP.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DH850 - System error when requesting the list box data: Unknown signature ?

  The SAP error message DH850, which states "System error when requesting the list box data: Unknown signature," typically indicates an issue with the data retrieval process in the SAP system, particularly when dealing with list boxes or dropdowns in the user interface. This error can arise due to various reasons, including configuration issues, data inconsistencies, or problems with the underlying database.
  Causes:
  
  Data Inconsistency: There may be inconsistencies in the data that the list box is trying to retrieve, such as missing or corrupted entries.
  Configuration Issues: Incorrect configuration settings in the SAP system can lead to this error, especially if the list box is not properly defined.
  Authorization Issues: Lack of proper authorizations for the user trying to access the list box data can also trigger this error.
  System Bugs: There may be bugs or issues in the specific version of SAP you are using that could lead to this error.
  Network Issues: Temporary network issues or connectivity problems can also cause this error when the system is unable to fetch the required data.
  
  Solutions:
  
  Check Data Consistency: Verify the data that the list box is trying to access. Ensure that all required entries are present and not corrupted.
  Review Configuration: Check the configuration settings related to the list box. Ensure that it is correctly defined and that all necessary parameters are set.
  User Authorizations: Ensure that the user has the necessary authorizations to access the data related to the list box. You may need to consult with your SAP security team.
  System Logs: Check the system logs (transaction SM21) for any additional error messages or warnings that could provide more context about the issue.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal. There may be specific patches or updates available that address this error.
  Restart the Application: Sometimes, simply restarting the SAP GUI or the application can resolve temporary glitches.
  Contact SAP Support: If the issue persists, consider reaching out to SAP Support for further assistance. Provide them with detailed information about the error, including the steps to reproduce it.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SE80 (Object Navigator) or SE11 (Data Dictionary) to investigate the underlying data structures.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  Documentation: Review SAP documentation related to the specific module or functionality you are working with, as it may provide insights into common issues and their resolutions.
  
  By following these steps, you should be able to diagnose and potentially resolve the DH850 error in your SAP system.