Setting Cursor

Hi ,

i have a requirement here,actually in one of the UI Screens we have a waherhouse number and than multiple task can be entered in the boxes below ,now my requirement is when ever the user presses enter the cursor should be positioned at the first empty screen,but every time the cursor goes to the warehouse number ,i have tried using set cursor field syntax in the PBO event ,though the sy-subrc retrns 0 still the cursor is not psitioned to teh next input field .

Appreciate your help on this.

Cheers

LK