This provides access to the 'expanded' object created by the expanding-reporter macro. Also used by the deprecated expand-on macro.
Expanded report items
The following are the list of keys which this supplier will return a value for.
The original row item which has been expanded on.
The value of the 'as' parameter in the original macro needs to be provided here, not the actual word 'as'. It will return the individual sub-item that was expanded on.