Multiple Platform Architectures not Supported in Deployment Mapping
If an AF3 Component Architecure has already been mapped via a Deployment
to a Platform Architecture, the definition of a second mapping via
drag/drop for an alternative Platform Architecture is not possible in
the Component-ECU-Mapping View.
In the Raw Mappings Pane, the definition of a new assignment does not
work, because the secdond alternative Platform Architecture is not
offered in the dialog (even it is already selected in the
ECU-Component-Mapping view).
(from redmine: issue id 1032, created on 2012-11-16, closed on 2013-02-04)