Sending multiple idoc's for 1 outbound message

Hello,

We are currently in a migration project with our BizTalk system that generates our EDI messages based on IDOC's from SAP.

It would be nice if we could create 2 idocs on for instance 1 invoice.

So an invoice is made, 2 IDOC's should be created, IDOC 1 being send to old Biztalk, IDOC 2 send to the new Biztalk. Is this in anyway possible?

We want to perform this action for every type of idoc, not only for Invoices, also WMTOORD, DESADV,.... and so on.

thanks for any feedback

regards,

Dimitri