I don't believe VAN's will reject any document as long as its well formed.  
Duplicates are between you and your partner.  

In my opinion best practice is that the control number on the outer envelope 
always be unique regardless of the documents contained therein.  However many, 
many organizations use one envelope instance per document type which will 
necessarily lead to a duplicate eventually if you send more than one document 
type.  It's done...however I consider it bad form and I won't do it.

On Oct 12, 2011, at 11:37 AM, jimdivoky wrote:

> What is the best practice for the use of Interchange Control References 
> (ICRs) in the UNB segment? Is it considered acceptable to duplicate ICRs for 
> different message types for the same Sender/Receiver ID pairs? Does, or will, 
> VANs such as GXS reject duplicate ICRs?
> 
> Thanks,
> Jim Divoky
> 
> 



[Non-text portions of this message have been removed]



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