reg : F4 help for custom fields in ALV report

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hi friends..

in my internal table i have fields including 1 custom field..

DATA : BEGIN OF i_final OCCURS 0,

pernr LIKE p0000-pernr,

begda LIKE p0000-begda,

plans LIKE ZPOSITION-plans, (custom)

werks LIKE pspar-werks,

end of i_final.

i want to display this i_final table in alv. for that i genetrate one fieldcatalog

PERFORM fcat USING:

'I_FINAL' 'PERNR' 'P0000' 'PERNR' '15' 'X' '',

'I_FINAL' 'BEGDA' 'P0000' 'BEGDA' '10' 'X' '',

'I_FINAL' 'PLANS' 'ZPOSITION' 'PLANS' '8' 'X' '',

'I_FINAL' 'WERKS' 'PSPAR' 'WERKS' '14' 'X' ''.

in custom table zposition, i maintain serch help for custom field "PLANS".

then i used reuse_alv_grid_display.. for all the std fields along wit custom fields

i got f4 all std fields but for my custom i am not getting the f4 help

how can i get the F$ help for this custom fields Zposition-plans..

plz give some idea