Message type: E = Error
Message class: SO - SAPoffice: message texts
Message number: 123
Message text: A reply to the document has already been sent
A reply to the document has already been sent.
You can send other replies to this document without using one of the
reply functions. However, these replies will not be recorded in the
correspondence history.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
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SO122 You cannot send from this folder
Self-Explanatory Message Since SAP believes that this specific error message is ...
SO121 Function <&> invalid for document <&>
Self-Explanatory Message Since SAP believes that this specific error message is ...
SO124 Function not possible when replying
Self-Explanatory Message Since SAP believes that this specific error message is ...
SO125 This folder must not be deleted
Self-Explanatory Message Since SAP believes that this specific error message is ...
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.
Click on this link to search all SAP messages.