Finally found solution.
Declare an internal table itab TYPE SORTED TABLE OF textpool.
READ textpool sy-repid INTO itab LANGUAGE 'EN'.
and insert following entries in INITIALIZATION
itab-ID = 'S'.
itab-KEY = 'P_TEST'. "parameter name
itab-ENTRY = ' Desc'. "parameter description
itab-LENGTH = '20'. "length of the text
Thanks
Kota