The following error message
Msg 1941, Level 16, State 1, Line 2
Cannot create non-unique clustered index on view ‘%.*ls’ because only unique clustered indexes are allowed. Consider creating unique clustered index instead.
is a run time error message of severity level 16. It can occur on all versions of SQL Server onwards to SQL Server 2000. This error message appears when you try to create a non-unique clustered index on a view.
As errors of Severity Level 16 are generated and can be corrected by the user. First index on a view should always be a unique clustered index.