Apex_collection.create_collection_from_query ---- ORA-01008

Question

I am creating a collection from a query and am having trouble referencing my page items in the query. I have already tried &My_ITEM. / V('My_ITEM') / :MY_ITEM with no success.
Error Message recieved:
ORA-20104: create_collection_from_query Error:ORA-20104: create_collection_from_query ExecErr:ORA-01008: not all variables bound
Sample of my apex_collection query :
BEGIN
apex_collection.create_collection_from_query(
p_collection_name => 'TEST',
p_query => 'SELECT CASE
WHEN d.visits = 0
THEN 0
ELSE ROUND (d.tot_usage / d.visits)
END THHP
FROM (SELECT SUM (CASE
WHEN b.fac_produsage = 0
THEN 0
ELSE ROUND(d.fac_prodsize
* (SELECT TO_NUMBER (piyc_codeval)
FROM schema.table1 z
WHERE table1_codetype = ''PRODUOM_CONV''
AND z.table1_codedesc = ltrim(rtrim(d.fac_produom)))
/ d.fac_prod_useratio) * b.fac_produsage
END ) tot_usage,
MAX (b.fac_ptcaredays) visits,
b.fac_datasdate || b.fac_dataedate period,
a.fac_unitcode || a.fac_unitdesc area,
d.fac_prodtype prodtype
FROM schema.table2_facdata b,
schema.table3_facusers c,
schema.table4_facunits a,
schema.table5_facprod d
WHERE c.fac_id = b.fac_id
AND b.facprod_id = d.facprod_id
AND b.fac_id = d.fac_id
AND a.fac_unitcode = b.fac_unitcode
AND a.fac_id = b.fac_id
AND b.fac_datasdate >= :P14_fac_datasdate -- page item
AND b.fac_dataedate <= :P14_fac_datasdate -- page item2
AND a.fac_unittype = :P14_fac_unittype -- page item3
GROUP BY b.fac_datasdate || b.fac_dataedate,
a.fac_unitcode , a.fac_unitdesc) d ',
p_generate_md5 => 'YES');
end;
Any Suggestions??

Answer 1

Working Solution:
http://kr.forums.oracle.com/forums/thread.jspa?threadID=580016