VT04 custom sort - almost completed, small problem

[mihailo_sundic]

Hello dear experts,

I'm having a problem with sorting in VT04 transaction.

I had a requirement to sort the deliveries in shipping document by itinerary from VL52.

I have successfully updated structure I_VTRLK field Data1 => I_VTRLK-USR01_VBLB
from itinerary table.
I used this code:

tables: vark, valw, vawk.
data: zitin like vark-ausl_reih,
        zwa_i_vtrlk like line of i_vtrlk.
loop at i_vtrlk into zwa_i_vtrlk.
 select single ausl_reih from vark into zitin where vark~kunwe EQ zwa_i_vtrlk-kunnr and vark~vstel EQ zwa_i_vtrlk-vstel and vark~aulwe EQ zwa_i_vtrlk-aulwe.
 zwa_i_vtrlk-usr01_vblb = zitin.
 modify i_vtrlk from zwa_i_vtrlk transporting usr01_vblb.
endloop.
sort i_vtrlk by usr01_vblb ascending.

Code works great, i_vtrlk is updated successfully and sorted by i_vtrlk-usr01_vblb.
Later, i_vtrlk should be inserted in vtrlk, and then vtrlk-user01_vblb is used as actual criteria in VT04.

I guess that vtrlk isn't getting updated from vtrlk, could anyone help me to determine 100% if
this is true, and possibly help me complete the requirement...

Regards,
Mihailo

[mihailo_sundic]

OK, I'll post the solution in case someone else needs this.

It can't be done using the I_VTRLK structure with user exits, but you need to
fill C_VTRLK earlier in the program by enhancing the code.

if sy-tcode EQ 'VT04'.
   tables: vark, valw, vawk.
   data: zitin like vark-ausl_reih.
   data: zwa_c_vtrlk like line of c_vtrlk.
   loop at c_vtrlk into zwa_c_vtrlk.
     select single ausl_reih from vark into zitin where vark~kunwe EQ zwa_c_vtrlk-kunnr and vark~vstel EQ zwa_c_vtrlk-vstel and vark~aulwe EQ zwa_c_vtrlk-aulwe.
     zwa_c_vtrlk-usr01_vblb = zitin.
     modify c_vtrlk from zwa_c_vtrlk transporting usr01_vblb.
   endloop.
 endif.

Regards,
Mihailo