Facing problem in to run a Procedure in annonmous block

Question

hi
i ceated a proceure
PROCEDURE validate_date( x_sco_id IN VARCHAR2,
x_role_date IN DATE,
date_type IN VARCHAR2 DEFAULT 'START_DATE',
x_sco_date IN DATE DEFAULT NULL,
x_use IN VARCHAR2 DEFAULT 'EXTERNAL',
x_return_date OUT DATE,
x_error_message OUT varchar2
AS
x_sco_start_date DATE;
x_sco_end_date DATE;
date_return DATE:=x_sco_date;
L_error_message varchar2(250);
BEGIN
SELECT ATTRIBUTE1,
date_required
INTO x_sco_start_date,
x_sco_end_date
FROM pa_control_items
WHERE ci_id=to_number(x_sco_id);
               IF x_sco_date is null then
               IF date_type='START_DATE' then
               date_return:=x_sco_start_date;                    
               ELSE
               date_return:=x_sco_end_date;               
               END IF;               
          END IF;          
          IF date_return is not null and date_type='START_DATE' and date_return >= x_role_date then
                    date_return:= x_role_date;
ELSIF date_return is not null and x_sco_date is not null and date_type='END_DATE' and date_return <= x_role_date then     
date_return:= x_sco_date;
ELSE
          L_error_message:='Date Entered is Invalid. Sco Start Date Either Sco End Date are not between Role Start Date and Role End Date';
RETURN;
END IF;                                   
          IF date_return is not null and date_type='END_DATE' and date_return>x_role_date then           
                    date_return:=x_role_date;
ELSE
          L_error_message:='Date Entered is Invalid. Sco END Date Can not be less than role end date';
RETURN;
END IF;                                                                           
END validate_date;
i m runing it
declare
l_date_return DATE;
l_error_message varchar2(250);
BEGIN
SAPE_UPDATE_SCO_DETAILS_PKG.validate_date(
10430,
'15-Oct-2009',
'START_DATE',
'14-Oct-2009',
'EXTERNAL',
'l_date_return',
'l_error_message'
dbms_output.put_line('error in validae date procedure '||' '||l_error_message);
end;
getting error
Error report:
ORA-06550: line 11, column 15:
PLS-00363: expression 'l_date_return' cannot be used as an assignment target
ORA-06550: line 12, column 15:
PLS-00363: expression 'l_error_message' cannot be used as an assignment target
ORA-06550: line 5, column 1:
PL/SQL: Statement ignored
06550. 00000 - "line %s, column %s:\n%s"
*Cause:    Usually a PL/SQL compilation error.
*Action:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

Answer 1

declare
l_date_return DATE;
l_error_message varchar2(250);
BEGIN
SAPE_UPDATE_SCO_DETAILS_PKG.validate_date(
10430,
'15-Oct-2009',
'START_DATE',
'14-Oct-2009',
'EXTERNAL',
'l_date_return',
'l_error_message'
dbms_output.put_line('error in validae date procedure '||' '||l_error_message);
end;
declare
l_date_return       DATE;
l_error_message   varchar2(250);
BEGIN
SAPE_UPDATE_SCO_DETAILS_PKG.validate_date(
               10430,
               '15-Oct-2009',
               'START_DATE',
               '14-Oct-2009',
               'EXTERNAL',
               *l_date_return,*
               *l_error_message*
     dbms_output.put_line('error in validae date procedure  '||'   '||l_error_message);         
end;     These are variable names do not put them in ' '.
Twinkle