Hide items from a drop down list on the portal

Hello Experts,

I have implemented the method if_ex_trip_web_customizing~user_exit_customizing. It deletes some items from the tables (tables exist as parameters in the function) when I run function PTRM_UTIL_CUSTOMIZING_GET to test. It works well.

I then test it on the portal. It hides not needed items from the drop down list on the first page. When I click on Start to get into next page, the not needed items from the drop down list on the second page are still there. It doesn't work well.

Why does the program work well when I use the function PTRM_UTIL_CUSTOMIZING_GET to test not on the portal? Did I miss anything when coding or the portal was not config well?

Please help!

Thanks,

AS