suggestvalues property for input field in POWL

Hi,

i have a  POWL in SRM7. i wanted to add new input field to the selection screen as part of the selection criteria.i have successfully added that. I understand that SAP internally adds a input field the screen, so there must be someway to check the property ' suggestvalues' of 'input field' ui element . any ideas how we can do this?

thanks