What permissions are needed to create ReqIF definitions?

You should have Administrator process role

Here is some more help information about ReqIF: https://jazz.net/help-dev/clm/index.jsp?topic=%2Fcom.ibm.rational.rrm.help.doc%2Ftopics%2Fr_reqif_format.html

Please note that there are some constraints for ReqIF import with RRC, if you plan to exchange data RRC an another RM application:

A ReqIF import only merges system-defined attributes and types. All other artifact types, attributes, data types (and folders if the ReqIF file includes them) are created in the project you are importing to. For example, if you have a Priority attribute in the ReqIF file, and the current project already has a Priority attribute, the ReqIF import will create another Priority attribute (called Priority2 ). Similarly, the import will not overwrite artifacts, so if you export data from a project and import the data into the same project, you will get duplicates of all the artifacts (complete with new IDs).