Clearing dropdown selection without refreshing the table

Hi, is there a way to clear the dropdown selection without refreshing the table?

I currently have a Create New Form page. If I click on BACK and then go into a new Create New Form page, the selection in the dropdown box should be cleared, but table (dropdown list) retained.

I populated the dropdown in WDDOINIT method, hence when I return to the Create New Form page the 2nd time, WDDOINIT does not get called, hence if I invalidate my dropdown, it will always be empty from then onwards.

I tried to SET_ATTRIBUTE to '' but it somehow refreshes the whole dropdown list to empty instead of just the selection.