Message type: E = Error
Message class: SO - SAPoffice: message texts
Message number: 457
Message text: No entry exists for sequential number <&>
There is no entry for the selected communication method with the
sequential number specified.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Specify a valid number or display all entries.
Error message extract from SAP system. Copyright SAP SE.
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SO456 <&1> is not a valid Internet address
Self-Explanatory Message Since SAP believes that this specific error message is ...
SO455 Attribute <&> not possible with telecommunications
Self-Explanatory Message Since SAP believes that this specific error message is ...
SO458 Enter a communication method
Self-Explanatory Message Since SAP believes that this specific error message is ...
SO459 You do not have an address. Object could therefore not be sent.
What causes this issue? You must be assigned an address in order to send extern...
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.