Automatic disaggregation in flexible planning(SOP)

Hello,

i am working on flexible planning of SOP.i have creatd infi structures,planning types and i am using consistent planning.

when i enter the sales plan at one level,i am not not able to aggregate the plan to higher levels of the info structure and also not able to disaggregate the plan to the lower level.In consistent plannign it is supposed to do aggregation and disaggregation automaticaly,but it is not working,am i am missing something

thanks

manjunath