Displaying report params in Header text

Question

I have built a number of reports that link to each other in a
drill down/master-detail style. These work great.
I want the child report to display the name of the parent object
in the header text as a title, i.e,
In the parent 'vehicles' report I click on 'cars' and the
child 'cars' report is called. A List of cars is displayed but I
want the custom Header text to display a title along the lines
of 'Selection: Cars'.
The 'cars' text gets passed as a parameter, so how can I refer
to it and display it in the Reports and Customization Form Text
tab?
Regards,
John

Answer 1

Ok, i tried the following in the advanced plsql code tab in
the 'After header' section.
begin
htp.p('Selected ROV: '||get_value('p_rovid'));
end;
and..
htp.p('Selected ROV: '||get_value('p_rovid'));
I get the error:
PLS-00201: identifier 'GET_VALUE' must be declared
Any ideas? Thank you!