Can some one explain each line of this abap code

Hi..
I got this code from a document, where they try to add account group (LFA1-KTOKK) to 0VENDOR_ATTR. I have no idea of ABAP syntax. Can some one tell me the meaning of each line of code.
Tables: LFA1.          "vendor master data table
data:    l_tabix      like sy-tabix.
case i_CHABASNM.
*Enhancement of Vendor Master Record
     WHEN '0VENDOR'.
       case i_datasource.
         WHEN '0VENDOR_ATTR'.
           data: l_s_BIW_LFA1_S like BIW_LFA1_S.
           loop at i_t_data into l_s_BIW_LFA1_S.
             l_tabix = sy-tabix.
             select single * from lfa1 where LIFNR = l_s_BIW_LFA1_S-LIFNR.
             if sy-subrc = 0.
               l_s_BIW_lfa1_s-ZZacctgrp = lfa1-ktokk.
               modify i_t_data from l_s_BIW_lfa1_s index l_tabix.
             endif.
           endloop.
       endcase.
   endcase.
Thanks in advance.

Hi
Tables: LFA1. "vendor master data table
"here by saying Tables they have delcared the LFA1 table for further use in the program"data: l_tabix like sy-tabix.
"here they have defined own table index by copying the structure of system index"case i_CHABASNM.
"when character"
*Enhancement of Vendor Master Record
WHEN '0VENDOR'.
"here it says that its 0vendor"case i_datasource.
"when this datasource"
WHEN '0VENDOR_ATTR'.
"when datasource 0vendor_attr"
data: l_s_BIW_LFA1_S like BIW_LFA1_S.
"here we are declaring an internal table like BW internal table"loop at i_t_data into l_s_BIW_LFA1_S.
"here looping at i_t_data table data into l_s_BIW_LFA1_S".l_tabix = sy-tabix.
"here we are saying that our defined table index is equal to system index"select single * from lfa1 where LIFNR = l_s_BIW_LFA1_S-LIFNR.
"selecting single rows from table lfa1 where lifnr is equal to l_s_biw_lfa1 field s-lifnr"
if sy-subrc = 0.
"if system field returns 0 that means the above line has been executed"
l_s_BIW_lfa1_s-ZZacctgrp = lfa1-ktokk.
"internal table field is equal to lfa1 field."
modify i_t_data from l_s_BIW_lfa1_s index l_tabix.
"changing the internal table data as per i_t_data"endif.
endloop.
endcase.
endcase.
THIS IS MY UNDERSTANDING PLEASE KINDLY CORRECT ME IF I AM WRONG.
thanks
harish

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