Normally, when you want to transfer data the file to application server, you will
have 3 steps:

1. Open file in application server by statement:
   

   OPEN DATASET file_name FOR OUTPUT IN TEXT MODE.

2. Transfer data from file by statement:

   TRANSFER itab TO file_name. 
   Note: This statement should be in LOOP statement for Internal table

3. Close file by statement:

CLOSE DATASET file_name.

Example

DATA: gv_dataset1(30) VALUE ’/temp/testfile.txt’.

OPEN DATASET gv_dataset1 FOR OUTPUT IN TEXT MODE. 
LOOP AT i_tab. 
  TRANSFER i_tab TO gv_dataset1.
ENDLOOP. 
CLOSE DATASET gv_dataset1.