How to write the ABAP code for Datasource Enhancment

Hi Team,
              Can you please help me how to write the code for the enhancement i have made to the standard datasource
i have added the fields ZZPayer and ZZPayer_access.
I just wanted to know how to write the ABAP code to populate the data for these fields.
Regards,
Pradeep P.

Hi
From a performance point of view would like to suggest a few changes :
WHEN '<DS name>'.
  select zzfields from <table> into itab
  for all entries in c_t_data where <condition>.
  If sy_subrc = 0.
loop at c_t_data assiging f_c_t_data.
read itab into wa_itab where key = f_c_t_data-key.
f_c_t_data-zzfield = wa-itab-zzfield.
endloop.
refresh itab.
regards,
aparna
endif.

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