Help: How to make a promoted property available

[DetRich]

Hello,
We are trying to develop a BizTalk solution as follows:

1. Customer submits a message. The message will contain a MessageID.
2. The message first hits a XML appliance which will pull the MessageID
from the body of the message, then add it to a Soap Header.
3. The message is then forwarded to BizTalk.

When the message enters BizTalk, we need to pull the MessageID from the Soap
header and promote it so that the MessageID can be fed into BAM.

How can this be accomplished?

We have a ticket open with Microsoft, who provided some code which pulls the
MessageID. The code is also supposed grab the MessageID from the Soap Header
(this part actually works) and then to make the MessageID a promoted
property, but this part is not working. Still working on getting this code
corrected...

Question: CAn a written property be picked up by the Tracking Profile Editor
so that the MesasgeID can be passed into BAM?

We have been told the other alternative is to use a custom pipeline which
will grab the MessageID from the Soap Header. But again, how can we get that
MessageID into BAM?

What is a written property?
How is it different from a promoted property?

Thanks for any suggestions!

DetRich