I'm using castle activerecord to map a generic IDictionary<enum, bool>

I've got it running and am able to save data but if I try to retrieve I get this exception:
{"The value \"0\" is not of type \"Project.PropertyType\" and cannot be used in this generic collection. Parameter name: key"}

PropertyType is my enum,
The mapping that AR has created is:
<class name="MyProject.Item, MyProject" table="Item">
...
<map name="Properties" access="property" table="ItemProperties" lazy="false">
<key column="ItemID" />
<index column="Idx" type="int" />
<element column="Value" type="System.Boolean, mscorlib"/>
</map>

I'm trying to figure out whats wrong here, as the examples I see seem to follow the same mapping..

Thanks

You've been mapping the index as "int". Try the mapping without a type definition for the index. If that's not working, try the fully qualified type of the enum (MyProject.xyz.MyEnum, MyProject).