Not able to select the item from autocomplete list

I am trying to select the item from autocomplete list and tried all the activity options like click or double click, hover text. user events like key press etc.

Steps:

  1. entered the text into the textbox (eg 019311)
  2. autocomplete list with complete description is displayed automatically. (eg 019311 - B&I APAC MANAGEMENT BP)
  3. tried capturing the list element that comes up after 019311 is typed into the textbox\autocomplete ui element. But the element id of the autocomplete list keeps changing everytime and hence could not be captured through selector property of any event\activity.

Need help on this urgently.