BSP Application session not closing in portal

Hai all

We developed BSP application, name bsp_salesmain. this application has controller which calls from

portals.this controller prepares a url to navigate to selected area from the choosen option of the portal menu.

say suppose , if i click on catalog(this event starts our main application bsp_salesmain then it prepares catalog url(../../catalog/session_catalog.htm?params).so another bsp application called into my portal where it performs all catalog business logic.

so internally another application started.here you can perform all the evnts provided

by catalog application. this is working smooth upto this point.but when i click on ordering(again my main appl prepares url which belongs to ordering application,say(../../ordering/session_order.htm?params)

my previous application session (catalog) is stiil retain in sm04 and not closing.if come back to catalog again

its showing all the previous selected values..if someone already worked on this kind of problem plz sujjest ur solution

Thnaks in advance.

leoiz