Business structure of EDI function

I'd like to know what kind of structure other companies have in place related 
to the setup and execution of EDI transactions with their customers and 
vendors.  

*       How many people are involved in the setup of new customer or vendor 
transaction sets (customer/vendor contact, creating maps, integration to BPCS, 
etc.)?  
*       What department(s) do they work in?  
*       How are the responsibilities broken out?  
*       Who reviews and handles any errors that occur once a transaction set is 
implemented (trading partner sends bad data, something doesn't map right in the 
integration, etc.)?  

Any responses to my "poll" will be greatly appreciated.

Thanks!

Debra Ivey
Application Development Manager
Red Gold