problem

Hi
i want to associate an incident to a problem
in my version 9.2 in the action list of request tab we do no have associated problem but we have search problem wen i chose this button one windows will open
then i can chose associate or new problem.

then the incident will add to problem windows but it show under the incident tab also . Why?
what is the meaning of associate problem and new problem.
more over if i close it in problem tab it still will be stay open under the incident tab. why?

in the other hand i do not know the relationship between problem and incident tab in manage engine.

i will appreciate your help in advance.

regards