How to debug PL/SQL functions? Passing parameter and debugger error

Hi,
How to debug a PL/SQL function in JDeveloper? There are two problems with it:
1) Don't see how it's possible to pass parameters required by function call (in the dialog opening after Debug -> Debug FUNCTION_NAME)
2) In a function returning table_name%ROWTYPE (and having a record declaration for table_name%ROWTYPE), debug gives error:
PLS-00103: Encountered symbol "/" when expecting one of ... in line
v_Return PL/SQL RECORD;
Debugging procedures works as expected.
Found a similar question without answer here:
Debugging PL/SQL with parameters

Check
http://www.oracle.com/technology/obe/obe9051jdev/plsqlobe/obeplsql.htm#t2
Frank

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