How To Fix SLEI_DEF_MSG129 - Read-only mode as system is in upgrade/maintenance mode

SLEI_DEF_MSG129 - Overview

• Message type: E = Error

• Message class: SLEI_DEF_MSG - Message class for LEI design time linkages

• Message number: 129

• Message text: Read-only mode as system is in upgrade/maintenance mode

Self-Explanatory Message

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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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SLEI_DEF_MSG129 - Details

• The SAP error message SLEI_DEF_MSG129 indicates that the system is currently in a read-only mode because it is undergoing an upgrade or maintenance. This means that certain operations, particularly those that require write access to the database, are restricted to ensure data integrity during the upgrade or maintenance process.
  
  Cause:
  
  System Upgrade: The SAP system is being upgraded to a newer version, which requires the database to be locked for write operations.
  Maintenance Activities: Scheduled maintenance tasks, such as applying patches or performing system checks, can also put the system into read-only mode.
  Configuration Settings: The system may have been explicitly set to read-only mode by an administrator for specific maintenance tasks.
  
  
  Solution:
  
  Wait for Completion: The simplest solution is to wait until the upgrade or maintenance process is completed. Once the process is finished, the system will automatically return to normal operation mode.
  Check Status: If you have access, check the status of the upgrade or