How To Fix GB756 - System error has occurred

SAP Error Message - Details

• Message type: E = Error

• Message class: GB - Messages used by the Boolean code generator

• Message number: 756

• Message text: System error has occurred

What causes this issue?

This only occurs if you try to include a validation plus the messages
used in it in a correction request. The message is already blocked by a
different request.
The message class is assigned to a local development class (e.g. $TMP)
Incorrect settings in the transport system

How to fix this error?

RESET N1
Using the information system in the correction and transport system,
try to find the request that is blocking the message. Messages are
transported under the program ID 'LIMU', object type 'MESS' and object
name 'ccnnn' (cc = message class, nnn = message number). Release the
correction request you find or delete the corresponding message entry.
Assign a transportable development class to the message class.
Check that you are at all able to enter objects in your request. E.g.
in transaction SE09 with double-click on the task, and then choose
"Display<->Change" and "Insert line". Try to enter one of the following
entries (noting any error messages that appear):
- LIMU MSAD cc for the message class
- LIMU MESS ccnnn for the message
- R3TR TABU GB93 with key <client> <validation> for validations
- R3TR TABU GB92 with key <client> <substitution> for substitutions
- R3TR TABU GB90 with key <client> <rule> for rules

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message GB756 - System error has occurred ?

  The SAP error message GB756, which states "System error has occurred," is a generic error message that can arise from various underlying issues within the SAP system. Here are some potential causes, solutions, and related information for this error:
  Causes:
  
  Database Issues: Problems with the database connection or database server can lead to system errors.
  Configuration Errors: Incorrect configuration settings in the SAP system can trigger this error.
  Authorization Issues: Lack of proper authorizations for the user trying to perform an action may result in this error.
  System Resource Limitations: Insufficient memory, CPU, or other system resources can cause the system to fail.
  Transport Errors: Issues during the transport of changes or updates can lead to inconsistencies in the system.
  Program Errors: Bugs or errors in custom ABAP programs or standard SAP programs can also lead to this error.
  
  Solutions:
  
  Check System Logs: Review the system logs (transaction codes SM21, ST22, and SLG1) for more detailed error messages that can provide insights into the root cause.
  Database Connection: Ensure that the database is up and running and that the connection settings in the SAP system are correct.
  Review Authorizations: Check the user’s authorizations to ensure they have the necessary permissions to perform the action.
  System Resources: Monitor system resources (using transaction ST06) to ensure that the system is not running out of memory or CPU.
  Transport Management: If the error occurred after a transport, check the transport logs for any errors and consider rolling back the transport if necessary.
  Debugging: If the error is related to a specific transaction or program, consider debugging the program to identify the issue.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide patches.
  
  Related Information:
  
  SAP Support: If the issue persists, consider reaching out to SAP Support for assistance. Provide them with detailed information about the error, including any logs or screenshots.
  Community Forums: Check SAP Community forums or other online resources where other users may have encountered similar issues.
  System Updates: Ensure that your SAP system is up to date with the latest patches and updates, as these can resolve known issues.
  
  Conclusion:
  The GB756 error is a generic system error that requires investigation to determine the specific cause. By following the steps outlined above, you can troubleshoot and potentially resolve the issue. If necessary, do not hesitate to seek help from SAP Support or your internal IT team.