Currently, complex handlers available by default are,
However do note that the newly created obs is not tied to the handler class used to create it. For example, an Obs created using the basic PatientHandler can be viewed and edited using PatientFiedGenObsHandler,
and vice versa.
Consider if any of these handlers, or other basic data types such as numerics, text or concepts etc. will meet your requirements. If not, do consider creating and registering a handler class of your own.
hence the user is displayed an auto complete box where he can start typing patient names.
Below : Screenshot of an Complex Obs created using a concept of type 'Patient'.