Hi Sree,
Goto Your Driver Program
Might already Declared check & change your subject
data :gv_subject TYPE sodocchgi1.
gv_subject -obj_descr = 'Your VF31 Subject '
gv_subject - sensitivty = 'P'.
pass your subject value to gv_subject -obj_descr and try
CALL FUNCTION 'SO_NEW_DOCUMENT_SEND_API1'
EXPORTING
document_data = gv_subject " Your subject add here ,
document_type = 'HTM'
put_in_outbox = 'X'
commit_work = 'X'
TABLES
object_header = it_table
object_content = it_table
receivers = it_table
EXCEPTIONS
too_many_receivers = 1
document_not_sent = 2
document_type_not_exist = 3
operation_no_authorization = 4
parameter_error = 5
x_error = 6
enqueue_error = 7
OTHERS = 8.
Kabil