Oracle stored procedure with parameters for IN clause

Question

I create this procedure to accepts a variable number of parameter values used to feed a IN clause? and I am getting this error message.
PL/SQL: ORA-00932: inconsistent datatypes: expected NUMBER got STRING_TABLE
please help
step 1
CREATE TYPE string_table AS TABLE OF varchar2(100);
step 2
CREATE OR REPLACE PROCEDURE planholderslist (
   p_lettingdate   IN       string_table,
   p_results       OUT      sys_refcursor
AS
BEGIN
   OPEN p_results FOR
      SELECT DISTINCT DECODE (TRIM (MIN (j.route)),
                              NULL, 'N/A',
                              TRIM (MIN (j.route))
                             ) routenumber,
                      l.lcontid contractid, (q.cdescr) jobdescription,
                      INITCAP (q.clocat1 || q.clocat2) LOCATION,
                      SUBSTR (q.cprojnum, 1, 10) projectnumber,
                         SUBSTR (l.letting, 3, 2)
                      || '-'
                      || SUBSTR (l.letting, 5, 2)
                      || '-'
                      || SUBSTR (l.letting, 1, 2) lettingdate
                 FROM vendor v,
                      vendaddr r,
                      letprop l,
                      planhold p,
                      proposal q,
                      project j,
                      propproj k,
                      bidlet bd
                WHERE v.vendor = r.vendor
                  AND k.contid = q.contid
                  AND k.pcn = j.pcn
                  AND l.lcontid = k.contid
                  AND p.vendor = v.vendor
                  AND l.letting = p.letting
                  AND TO_CHAR (bd.datelet, 'MM/DD/YYYY') IN p_lettingdate
                  AND l.CALL = p.CALL
                  AND r.addrnum = p.billto
                  AND bd.letting = l.letting
             GROUP BY q.cdescr,
                      q.clocat1,
                      q.clocat2,
                      bd.letting,
                      l.letting,
                      l.lcontid,
                      q.cprojnum;
END planholderslist;
/

Answer 1

Ok the procedure compiled without any error message. my next question is how can I execute this procedure in my asp.net application. I can I pass multiple values to the parameter.
CREATE OR REPLACE PROCEDURE planholderslist (
   p_letting_date   IN       string_table,
   p_results        OUT      sys_refcursor
AS
BEGIN
   OPEN p_results FOR
      SELECT DISTINCT DECODE (TRIM (MIN (j.route)),
                              NULL, 'N/A',
                              TRIM (MIN (j.route))
                             ) routenumber,
                      l.lcontid contractid, (q.cdescr) jobdescription,
                      INITCAP (q.clocat1 || q.clocat2) LOCATION,
                      SUBSTR (q.cprojnum, 1, 10) projectnumber,
                         SUBSTR (l.letting, 3, 2)
                      || '-'
                      || SUBSTR (l.letting, 5, 2)
                      || '-'
                      || SUBSTR (l.letting, 1, 2) lettingdate
                 FROM vendor v,
                      vendaddr r,
                      letprop l,
                      planhold p,
                      proposal q,
                      project j,
                      propproj k,
                      bidlet bd
                WHERE v.vendor = r.vendor
                  AND k.contid = q.contid
                  AND k.pcn = j.pcn
                  AND l.lcontid = k.contid
                  AND p.vendor = v.vendor
                  AND l.letting = p.letting
                  AND (TO_CHAR (bd.datelet, 'MM/DD/YYYY') IN (
                                                   SELECT COLUMN_VALUE
                                                     FROM TABLE
                                                               (p_letting_date))
                  AND l.CALL = p.CALL
                  AND r.addrnum = p.billto
                  AND bd.letting = l.letting
             GROUP BY q.cdescr,
                      q.clocat1,
                      q.clocat2,
                      bd.letting,
                      l.letting,
                      l.lcontid,
                      q.cprojnum;
END planholderslist;