Hello rmg,
thanks for your reply.
I created the service with the steps (BRANCH, MAP) described on page 61 of the User Guide.
But where to use this custom service and how to get value of the ID qualifier code ?
For the moment i try to use it in the service i had defined for the processing rule. But there a have
only a bizdoc var. Where to find the qualifier and how to set the new value for sender and receiver back for correct partner recognition ?
Can you provide an example ? 
Thanks a lot.
Sebastian
#Integration-Server-and-ESB#webMethods#B2B-Integration