Answer Posted / anuraj singh rana

As there are two type of bdc methods.
1 . Call transaction method
2 . Session method.

1. In call transaction .
we use to upload the data by gui_upload.

and at last we write
call transaction 'trasaction name' using 'A'...

2. In Session method .
we uses three transactions

bdc_open_group.
bdc_insert.
bdc_close_group.

if we are uploading data from application server
open data set.
read / write data set.
close data set.

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