create or replace PROCEDURE check_posting(vfrom date, 
    vto date,vnarr varchar2(10),
      vbranch varchar2(10), 
      vgroupcd  varchar2(10),
      vRecord IN OUT BOOLEAN) is
       dtfr date;
       dtto date;
          cursor c1 is select distinct to_date(substr(narr,19,10),'DD-MM-YYYY'),
          to_date(substr(narr,30,10),'DD-MM-YYYY')
          from partytrn where trn_type='I' and
         narr like 'Inte. Debited For%' and
  (party_cd in (select par_code from partymst
         where par_code is not null ));
     begin
       open c1;
       Loop
           fetch c1 into dtfr, dtto;
           exit when c1%notfound;
          if vfrom >= dtfr and vfrom <= dtto then
               vRecord := TRUE;
          end if;
          If vto >= dtfr and vto <= dtto then
               vRecord := TRUE;
          end if;
       end loop;
       CLOSE c1;
 * end check_posting;
SQL> /

Procedure created.

SQL> declare
  2    x date := '01-APR-2006';
  3    y date := '30-APR-2006';
  4    z varchar2(50) := 'test';
  5    a varchar2(10) := 'HO';
  6    b VARCHAR2(10) := 'AG';
  7    c boolean := FALSE;
  8  begin
  9    exec check_posting(x,y,z,a,b,c);
 10   dbms.output.put_line('value of c is : '||c);
 11  end;
 12  /
  exec check_posting(x,y,z,a,b,c);
       *
ERROR at line 9:
ORA-06550: line 9, column 8:
PLS-00103: Encountered the symbol "CHECK_POSTING" when expecting one of the following:
:= . ( @ % ;
The symbol ":=" was substituted for "CHECK_POSTING" to continue.

SQL> declare
  2    v_bool  boolean := true;
  3  begin
  4  dbms_output.put_line(v_bool);
  5  end;
  6  /
dbms_output.put_line(v_bool);
*
ERROR at line 4:
ORA-06550: line 4, column 1:
PLS-00306: wrong number or types of arguments in call to 'PUT_LINE'
ORA-06550: line 4, column 1:
PL/SQL: Statement ignored

SQL> declare
  2    v_bool  boolean := true;
  3  begin
  4    dbms_output.put_line('Value is '||v_bool);
  5  end;
  6  /
  dbms_output.put_line('Value is '||v_bool);
                       *
ERROR at line 4:
ORA-06550: line 4, column 24:
PLS-00306: wrong number or types of arguments in call to '||'
ORA-06550: line 4, column 3:
PL/SQL: Statement ignored