Delete records in Hashed table

Hi Friends,

How to delete records in a hashed table. Below is my code. I am getting error..."You can not use explicit/implicit operations on hashed tables". Could you plz help.

loop at xth_data ASSIGNING <ls_data2>.

ASSIGN COMPONENT 'S_CHAS-0FISCPER3' OF STRUCTURE <ls_data2> TO <fiscpd>.

if <fiscpd> <> 12.

delete xth_data.

endif.

endloop.

Regards,

Chinna