Creating TO using FM L_TO_CREATE_DN

Hi Expert,

I am trying to create TO using FM L_TO_CREATE_DN for a delivery number. My code is below:

CALL FUNCTION 'L_TO_CREATE_DN'
       EXPORTING
         i_lgnum                    = l_lgnum
         i_vbeln                    = l_vbeln
         i_squit                    = c_x         
         it_delit                   = t_delit     
         I_TEILK                    = c_x
       IMPORTING
         e_tanum                    = l_tanum
       TABLES
         t_ltak                     = t_ltak     
         t_ltap_vb                  = t_ltap1     
         t_wmgrp_msg                = t_wmgrp_msg
       EXCEPTIONS
         foreign_lock               = 1
         dn_completed               = 2
         partial_delivery_forbidden = 3
         xfeld_wrong                = 4
         ldest_wrong                = 5
         drukz_wrong                = 6
         dn_wrong                   = 7
         squit_forbidden            = 8
         no_to_created              = 9
         teilk_wrong                = 10
         update_without_commit      = 11
         no_authority               = 12
         no_picking_allowed         = 13
         dn_hu_not_choosable        = 14
         input_error                = 15
         OTHERS                     = 16.

But I am not getting any TO using this code. Also no error messages. How to get TO using above FM?

Any possible solution would be gratefully accepted.

Thanks,

Arindam Samanta.