Invoice Split for Foreign Trade data

Hello All,

While I am combining multiple invoice for the same customer same material the invoice are getting split due to the Foreign trade data. I tried to change the VTFL header config by changing

at item level

Copying requirements   004  Deliv-related item

Data VBRK/VBRP         001  Inv.split (sample)

header level

Copying requirements   003  Header/dlv.-related

Determ.export data

Assignment Number      E

Reference number       A

I have saw many post in SCN and made the changes as per the suggestion but still its not working. Could anyone please help me on this.

Thanks

Kumar