Hello Experts,
My code for search help on field "ZTZONE" goes like this(which does not work)
method GET_V_ZTZONE.
DATA:
valuehelp_descr TYPE REF TO cl_bsp_wd_valuehelp_f4descr,
ls_map TYPE if_bsp_wd_valuehelp_f4descr=>gtype_param_mapping,
lt_inmap TYPE if_bsp_wd_valuehelp_f4descr=>gtype_param_mapping_tab,
lt_outmap TYPE if_bsp_wd_valuehelp_f4descr=>gtype_param_mapping_tab.
ls_map-context_attr = 'ZTZONE'. "#EC NOTEXT
CONDENSE ls_map-context_attr NO-GAPS.
ls_map-f4_attr = 'KEY'. "#EC NOTEXT
APPEND ls_map TO lt_outmap.
CREATE OBJECT valuehelp_descr
EXPORTING
iv_help_id = 'SC_ZONEDEF' "#EC NOTEXT
iv_help_id_kind = if_bsp_wd_valuehelp_f4descr=>help_id_kind_callback
iv_input_mapping = lt_inmap
iv_output_mapping = lt_outmap
iv_trigger_submit = abap_true.
rv_valuehelp_descriptor ?= valuehelp_descr.
endmethod.
The values come up on the screen to choose. but when I choose one, the same is not reflecting on the screen.
I changed ls_map-context_attr = Z'TZONE'. to ls_map-context_attr = 'STRUCT.ZTZONE'. but no improvement 
APPENDed ls_map to lt_inmap too but no improvement
SC_ZONEDEF is actually a data element which points to search help SCSEAR_TZ which has a selection method of TTZZ. Not sure what should iv_help_id be!
Thanks for your valuable suggestions.