An alternative name. For example, for a more easily identifiable column descriptor you can display the alias instead of the member name.
Takes a string as an argument and returns an alias name to the function
that calls @ALIAS.
Because functions that take strings as arguments may not function correctly
if the string matches a member alias, use the function @ALIAS to pass member
alias names as strings, for example when passing alias names as strings to
functions such as @ISUDA, @UDA, @CONCATENATE, @SUBSTRING, @MATCH, or @NAME.
For example, if the value “US$” is both an alias and a user-defined
attribute, pass the string using @ALIAS:
IF(@ISUDA(@ALIAS("US$"))) ... ENDIF