Problem enabling Write Back

Question

I am having a problem getting the INSERT statement to execute in my writeback setup.
I am trying to set this up on the standard EMP table. I created an additional table to store writeback comments related to the EMP table. The Write Back table has columns EMP_ID, USER (from BI), DATE, and COMMENTS.
My problem is that if I try to enter comments for an employee where the comments is already blank, it doesn't process the insert statement I specified, it tries to run the UPDATE statement. I verified this in NQQuery.log.
Out of curiosity, I manually entered a record into the write back table and tried to change the value in my write back field in BI, and it worked - because it's only looking at the update statement for some reason, so that part is fine. It just seems to be completely ignoring the insert statement.
I tried to remove the UPDATE statement to see if it would recognize my insert statement, but it gave an error when I tried that:
State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 27024] The EXECUTE PHYSICAL statement must specify a physical SQL statement to execute. (HY000)
Here is my XML template for writeback:
<?xml version="1.0" encoding="utf-8" ?>
<WebMessageTables xmlns:sawm="com.siebel.analytics.web/message/v1">
     <WebMessageTable lang="en-us" system="WriteBack" table="Messages">
          <WebMessage name="SetEmpComments">
               <XML>
                    <writeBack connectionPool="Writeback Connection Pool">
                         <insert>INSERT INTO EMP_WB_TEST
                         VALUES('@{c3}',SYSDATE,'@{c4}','@{c1}')</insert>
                         <update>UPDATE EMP_WB_TEST SET dt_crte=SYSDATE, user_name='@{c4}', comments='@{c1}' WHERE empno='@{c3}'</update>
                    </writeBack>
               </XML>
          </WebMessage>
     </WebMessageTable>
</WebMessageTables>

Answer 1

Just a wild quess - are your values listed in the order corresponding to the columns order in the write back table ?
What if you rewrite your insert as
<insert>INSERT INTO EMP_WB_TEST(empno,dt_crte,user_name,comments)
VALUES('@{c3}',SYSDATE,'@{c4}','@{c1}')</insert>?
Best regards
Maxim