Excise invoice

Hi

I want to creat one proforma invoice for multiple deliveries. and with that proforma invoice trying to create single excise invoice.

But i am facing problem in creating proforma with multiple deliveries because of DIFFERENT NUMBER RANGE IN HEADER (delivery)AT FOREIGN TRADE --- UNDER ORGANIZATION --- NUMBER OF FOREIGN TRADE DATA - ( which is internally assigned by the system)

If i can get where this number is assign my problem is solved

Rao