Entity Record Summary View

I've created an entity backed record, and happily pulling data from the DB.
I've created an interface to use as the summary view which has two RI's defined.

The first RI is a reference to a CDT based on the DB table above, and the second is a simple boolean type.

When I try to call the summary view at Run time, I'm getting an error that the interface is expecting two parameters but I'm only providing one.
When I look at my record definition .. summary is

interface(

CDT:{

CDTFIELD1:rf!field1
CDTFIELD2:rf!field2
}
BOOLEAN:true()

)

Am I populating the CDT correctly ? In all the examples I can find the summary view is only populating RI's directly.