Using cookies through PI

Ext System -> SAP PI -> SAP backend.
User credentials contained in cookie in SOAP request to SAP PI should be forwarded and used to log on to SAP backend system. How to propagate the user credentials in the cookie and what adapter could be preferred for the connection to SAP backend? Note that we do not want all backend users to have WS Runtime credentials (execution of WS calls), and therefore WS adapter may be out of the question..?
Appreciate any input to how this can be solved.
Thank you
regards Ole

In standard the user of PI is a standard service user.
in PI 7.0 the development introduced principal propagation for some scenarios.
That means, PI logs on with a specific user which is provided by the sender of the interface.
There are threee types of adapters whch are supported. With SOAP adapters you can use PP, but not with cookies.
There nothing in online help, that is helpful
Here some blogs about the topic:
Edited by: Stefan Grube on Feb 22, 2011 2:25 PM

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