User mapping between 2 SAP Enterprise Portals

Hi,

i would like to enable user mapping for our 2 eps, that are forming a Federated Portal Network.

We successfully managed to enable SSO (without user mapping) between them. But i can't edit user mapping property for users in the identity management.

The reason, why we are trying is that we don't want to synchronize the user stores between the portals.

(But this is a reqeuirement for FPNs. Users, that use remote content must exist in both user stores.)

In order to get the possibilty to specify the user mapping we tried to create the producer system in the system landscape of the consumer portal.

We use the EP 5.0 as template, but this template didn't provide the User Mapping Type property.

Do you know a way to enable user mapping between the 2 portals?

Or do you know a way to realize a FPN without synchronization of user stores?

Regards,

Marcus