While I know you are not supposed to be able to add multiple GUIDs to any table, on the systems I have worked on I have found that with table variables it is possible. When I run the following I do not get any errors

declare @TableVar table(MyID INT IDENTITY PRIMARY KEY CLUSTERED

, NEXTFIELD varchar(10), nextfield2 varchar(10)

, ROWGUID UNIQUEIDENTIFIER

, ROWGUID2 UNIQUEIDENTIFIER

)

insert into @TableVar (NEXTFIELD, nextfield2, ROWGUID, ROWGUID2)

values ('Test1', 'TEST1', NEWID(), NEWID())

, ('Test2', 'TEST2', NEWID(), NEWID())

, ('TEST3', 'HOW', NEWID(), NEWID())

select * from @TableVar