Usage of text symbols in assistance class

Hi All,

  I am working with the assistance class.In text symbols i created one text with sym= 001,text = welcome and mlen = 8.

     I passed this number as key to get_text method  as

    DATA: lv_text TYPE string.

   lv_text = wd_assist->if_wd_component_assistance~get_text( key = '001' ).

    and i binded the lv_text to text property of i/p element textview using set_attribute method but i am getting the error as text 001 not found

      Can anybody give me the solution for this........