Passing Ref Cursor as parameter to object type method

I am encountering a problem passing a parameter of type REF CURSOR to methods of a set of object types I am developing.
Here is an example of what I am trying to do:
create or replace package p1 as
type c_Cursor is ref cursor;
end p1;
create or replace type t_Object as object
not instantiable method m1(p_Cursor in p1.c_Cursor) return varchar2
) not instantiable not final;
create or replace type t_Subtype under t_Object as
overriding method m1(p_Cursor in p1.c_Cursor)
return varchar2
The problem is that the PL/SQL compiler gives the error message PLS-00201 "p1.c_Cursor" not defined.
According to my PL/SQL book (SF's Oracle PL/SQL Programming) the only way to use a ref cursor as a parameter to functions/procedures is to wrap them in a package. Indeed I have developed a test procedure in a different package that uses p1.c_Cursor as a parameter and it works fine.
Oracle's documemtation suggests that object security (roles etc) can cause this error but as all the objects are being created in the same schema I don't see how this should be a problem.
If anyone can suggest how to get around this problem I will be very grateful.
BTW, if there are any mistakes in my sample code it's because I am writing it from memory as I don't have Internet access at work.
Thanks,
Charles.

Thanks for your reply. I am still baffled as to why it doesn't work but, as you correctly point out, SYS_REFCURSOR works just fine. I figured that out earlier today and now the problem is solved.
Charles.

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    Edited by: 929463 on Apr 23, 2012 12:38 AM

    929463 wrote:
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    The PL/SQL proc can be tuned and optimised, modified for catering for data model changes and so on. Without your client code having to be even recompiled as it is isolated against these server changes.
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          

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      return 0;
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        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