Not able to pass WBS elements from excel to BO Prompt

Dear All,

Curently i am working on one dashboard in which i am selecting One sector, One projects ( Projects gets populated on selection of sector), Then on selection of projects WBS Elements gets populated ( used multiple selection option for wbs element). when i am trying to pass wbs element as a prompt that perticular quries gets failed and gives the error as a Request Processing Failed [XLS000009]. Basically that WBS element has few special characters as - and balnk space (not sure due to this wbs element can't be read) i ahve check with key as well as text option at BW side but for both cases giving the same error so can any one please suggest any workaround for the same.

Regards,

Rohan Ghadi