Hoooray!!! Victory is MINE!!! (well, at least for the moment)..

I've finally been able to resolve my BizTalk headache (from this post). The main issue had to do with non-matching .XSD file for the .NET Client Component that I created for H.I.S. (Host Integration Server). Once you create the .NET Client Component for your TI (Transaction Integrator) project a .DLL and .XSD file is created for you.

From the BizTalk Orchestration project, you then add a reference to the (TI) .DLL you created, and import the .XSD into your project. The .XSD defines a type of XML document (including parameters and data types) that you are passing between environments.

Well, if a change is made to the (TI) .DLL, you will need to re-import the updated .XSD into your BizTalk project so BizTalk can recognize any changes that have been made.

So after that hurdle, and a whole mess of smaller hurdles, i've finally been able to get things working...

Here's a little diagram of what the system looks: