TPT

Can any one suggest how to load duplicate records using TPT.
I have tried with TPT LOAD operator into MULTISET with NOPI table. But all the records are inserted into ERR1 table. Since load operator using FLOAD.
As UPDATE operator will use MLOAD operator, Please provide the sample code with UPDATE operator to load flatfile with ~ delimiter having duplicate records.
Kindly help me ASAP....
Thank You.