Carrier notification on sales order

Hi all,

How does SAP handle the standard scenario:

A sales order is created with a forwarding agent (carrier company) set in the partners tab. Upon saving, we want to generate a document to send to our carrier company telling them how many trucks to send, the expected price and date. Is there a default document for this? It looks like most are only created upon delivery - which is too late because at that point the trucks will already have arrived.

Thanks,