Is it possible to batch upload invoices to oracle with a pre-determined invoice number?

Hi,

I normally use an upload file to automatically load multiple invoices in one go into oracle. These invoices are then given an invoice number.

There are certain invoices which I need to upload from another system which already have invoice numbers. As they need to have the same invoice number, I have to manually input them one by one by entering the invoice numer.

Is there a way to batch upload a number of invoices with pre-determined invoices using an upload file?

thanks