APEX Collection - how to process

Hello all.
I am fairly new to apex and using apex 4.0. I have a SQL report based on collections, with 2 columns updateable. Following is the query.
SELECT APEX_ITEM.TEXT(1,SEQ_ID) AS SEQ_ID,
APEX_ITEM.TEXT(2,c001) AS R_TYPE,
APEX_ITEM.TEXT(3,c002) AS TA_ID,
APEX_ITEM.TEXT(4,c003) AS ANSWER_ID,
c008 AS R_TITLE,
CASE WHEN c001 = 'QUESTION'
THEN APEX_ITEM.CHECKBOX(40,c009)
ELSE APEX_ITEM.HIDDEN(40,c009) END AS ANSWER_Y_N,
CASE WHEN c001 = 'QUESTION' AND c011 = 'Y'
THEN APEX_ITEM.TEXTAREA(41,c010,3,40)
ELSE APEX_ITEM.HIDDEN(41,c010) END AS ANSWER_TEXT,
APEX_ITEM.TEXT(11,c011) AS TEXT_FLAG
FROM APEX_COLLECTIONS
WHERE COLLECTION_NAME = 'AUDIT_ANSWER'
AND c002 = :P18_TA_ID
ORDER BY c004, c005, c006, c007
ANSWER_ID is the primary key which is not displaying. R_TITLE is the question which is display only. ANSWER_Y_N is a column having Y or Null answers. ANSWER_TEXT is enterable comment column.
After SAVE button, it fires page process (On Submit - Before computations) having following code -
BEGIN
FOR i IN 1..APEX_APPLICATION.G_F04.COUNT
LOOP
IF APEX_APPLICATION.G_F02(i) = 'QUESTION'
THEN
APEX_COLLECTION.UPDATE_MEMBER_ATTRIBUTE('AUDIT_ANSWER', APEX_APPLICATION.G_F04(i), '9', APEX_APPLICATION.G_F40(i));
APEX_COLLECTION.UPDATE_MEMBER_ATTRIBUTE('AUDIT_ANSWER', APEX_APPLICATION.G_F04(i), '10', APEX_APPLICATION.G_F41(i));
END IF;
END LOOP;
FOR r IN ( SELECT c003, c009, c010
+ FROM APEX_COLLECTIONS+
+ WHERE COLLECTION_NAME = 'AUDIT_ANSWER' )+
LOOP
UPDATE VW_OTA_AUDIT_ANSWERS
SET ANSWER_Y_N = r.c009,
ANSWER_TEXT = r.c010
WHERE ANSWER_ID = r.c003;
END LOOP;
END;
It is not updating the collection. What could be the problem here.
Edited by: 930664 on Nov 29, 2012 3:53 AM

Hi, to all.
Sorry if I introduce here my question, and not create another thread, I made my example in application from the owner of this thread (hope he doesn't mind) at page 2, because in my workspace didn't work, don't know why.
Here is my question: Why after navigate in interactive reports headings are disappears. I have one apex_collection for which I want dynamic headings, and it seams only first time they appear.
Link http://apex.oracle.com/pls/apex/f?p=40150:2:7122052600559::NO:::

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