Register your custom link type by passing the name of the MATLAB® function file to the rmi command as follows:
rmi register mytargetfilename
Once you register a link type, it appears in the Requirements Traceability Link Editor as an entry in the Document type drop-down list. A file in your preference folder contains the list of registered link types, so the custom link type is loaded each time you run MATLAB.
When you create links using custom link types, the software saves the registration name and the other link properties specified in the function file. When you attempt to navigate to such a link, the RMI resolves the link type against the registered list. If the software cannot find the link type, you see an error message.
You can remove a link type with the following MATLAB command:
rmi unregister mytargetfilename