General header text copying text to multiple deliveries

Hi,

Can anyone tell me if it's normal standard behaviour for a general header text to be copied to non order relevant documents when there is a multiple delivery?

We have the following:

Order 1 - General header text

Order 2 - No text

If a single delivery for order 1 is created, then the general header text appears on all documents relating to order 1, this is fine.

However, if there is a multiple deliver for order 1 and order 2, the general header text (from order 1) will appear on all documents relating to order 1 and order 2, such as order 2's invoice, which is wrong.

Can anyone help?