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TR900 - Upgrade still running: Logon not possible
SAP Error Message - Details
Message type: E = Error
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Message class: TR - Change and Transport System
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Message number: 900
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Message text: Upgrade still running: Logon not possible
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What causes this issue?
The system is locked for an upgrade.
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?
Log on again later.
Error message extract from SAP system. Copyright SAP SE.
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SAP messages fall into 3 different categories: Error messages
(message type = E), Warnings (W) or Informational (I) messages.
An error message will prevent you from continuing your work - it is a hard stop and you need to fix the error before you can proceed. A warning message will stop your work, however, you can then bypass the warning by pressing the Enter key on your keyboard. That said, it is still good practice to investigate the cause of the warning message and address it. An information message will not stop your work and is truly just for informational purposes.
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