I already tried in BackGround script 

I tried in background script

gs.info(new getBusinessUnit().businessunit());
gs.info(new getUserDetail().businessunit());

*** Script: ac26c204870221003ff35d88e3e3ec61
*** Script: ac26c204870221003ff35d88e3e3ec61

I got perfectly in background script , not at filters side.
javascript:new getBusinessUnit().businessunit()
javascript:new getUserDetail().businessunit()