Simple dropdow to change "status" for content filed with node reference

I want to do a simple thing but it's driving me crazy. I have two content types: student and courses. I have a field on my student's content type with which the admin can select wich courses belongs to an stud开发者_运维百科ent (Student do Course I, Course II, etc)...this is simple because i'm using "node reference" for the content populated with course content type...but i need to give an status to particular courses, i.e "John is in Pachwork course and has paid for it"....so, summarizing, i need when the admin chose a course for a student appears a combobox-dropdow to select if paid or not that particular course...but i'm trying to do that all the afternoon but i can't accomplished anything good. Can you help me?

Thanks!!

Using the latest dev of CCK 3 and its multigroup module, set up a multigroup consisting of a nodereference and its status (a selectlist or taxonomy term).