Mapping can not be found, in debug this maps to Object (@MemRef) all of the Objects attributes properties come down the wire, but the Object type is not found.
The Java class for FrequencyDimension is very simple, all it does is have a default constructor and extend Dimension.
There does not seem to be any relationship between the classes that don’t map, some extend already mapped classes some do not, sometimes the bad mapping is in objects held in a List, sometimes it isn’t. Actually, there is one relationship, I think of the classes that don't map, they are the latest classes written, and I wonder if this is a compiler issue, not exporting the classes properly?
This seems to be because none of my code was explicitly instantiating or using the type FrequencyDimension, so I guess it was not compiled into the swf. This seems to be by design, although IMHO this is bad design as it causes confusion when working with DataServces and it forces unnecessary code to be written.