How To Fix GB756 - System error has occurred

GB756 - Overview

• 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