I'm trying this solution, but I got the error "ORA-03001: unimplemented feature".

Steps to reproduce:
1. Create an empty table : create table test_clob (XCLOB clob)
2. Create an test insert dml: insert into test_clob values :XCLOB
3. Configure XCLOB variable as your response
4. Execute the update

I tryed the datatypes CLOB and Temporary CLOB, but I got the same problem.