Copy control between Billing doc and a sales document.

Hi guys,

I have some issue with copy control.

When I create a Credit with reference to a billing some data are missing in the credit note.

Actually there are some information laid against the item in the billing doc( such as ordering data) . Those information can't be copied to the credit note as they are in the header level in the credit document.

Is anybody know how to copy information from Item level to header level?

Cheers Guys.

Julien