Appending 2 CLOBs- Facing ORA-06502

Question

Hi All,
Am trying to append a CLOB variable to another CLOB variable.
Declare
l_dest CLOB := ' ';
l_src CLOB;
CURSOR C1 IS
<select cOLUMN_NAME1 FROM hz_parties>
Begin
     FOR tmp_rec in C1
     LOOP
          Calls a procedure get_msg and outputs the data into l_src
CLOB variable
          get_msg(tmp_rec.column_nam1,l_src);
          DBMS_LOB.APPEND(l_dest,l_src);
END LOOP;
END;
The procedure is able to append the data to l_dest CLOB variable.But it is erroring out when the
size of the l_dest CLOB variable reaches to 26213.
Following error is thrown
Code - ORA-06502: PL/SQL: numeric or value error.
I have to put all the information fetched from the table into a CLOB variable. Finally i will be passing this CLOB variable to a API.
I have gone through all the info about the DBMS_LOB.append,but culdnt able to resolve it....?
If anyone has come across this situation.please let me know how to resolve it ??

Answer 1

Exception is raised, when i call the DBMS_LOB.APPEND(l_dest,l_src);
If i filter out the select statement in the cursor say rownum < 70; It is successfully appending the details to the l_dest CLOB. But if there are records with more than 70, then it is erroring out.
get_msg(tmp_rec.column_nam1,l_src) is the procedure which just fetches the following
fnd_message.set_name ('XXAAA', 'XXAA_VALIDATION');
fnd_message.set_token ('source_info',pi_some_parameter);
l_src := fnd_message.get;
l_src := l_src||CHR(10)||CHR(10);