Error message when editing sudo policy "visudo: Warning: Runas_Alias `SOME_USER' referenced but not defined" (4271039)

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Error message when editing sudo policy "visudo: Warning: Runas_Alias `SOME_USER' referenced but not defined"
Description

The following error message is displayed when trying to edit the sudoers policy:
"visudo: Warning: Runas_Alias `SOME_USER' referenced but not defined"
Cause

CAUSE 1:
One of your sudoers entries contains a RunAs alias that has not been defined.
E.g
myuser ALL=(MYRUNAS_ALIAS) ALL

CAUSE 2
The entry in the RunAs section is actually a user, however you have used Capital letters for the name.
Therefore sudo believes that this is an alias.
Note that this error will also occur when using normal sudo and the 'visudo -c' command
Resolution

RESOLUTION 1:
Add the missing RunAs alias to the sudoers file:
E.g
RunAs_Alias MYRUNAS_ALIAS = otheruser

RESOLUTION 2:
Avoid having capital letters in the RunAs section if this is a user.
Sudo interprets entries starting with capital letters as Aliases.

The message can be safely ignored, however it is best practice to avoid using capital letters for user entries.

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