Dunning procedure

Dear All,

Im new in SAP, so have few questions about FI-CA Dunning procedure.

May be some one know, what FM do i have to use to create dispute case in dunning activity?

I allready done dunning setting, but i dont know how i can shudle the proposal run and activity run not for one time, i guess i wont find the way to solve this problem. But maybe some of you know? I looked to saphelp, didnt find anything useful there, whare i can find more information about dunning in ISU?

thanks