I am new to Loadrunner scripting, having issue with .dat file when used for multiple VUs and iterations. I have to execute script for 50 VUs and 2 iterations. It works with "parameter with Unique value" but receive error messages while using .dat file as 'unique constraint' whereas I am changing the .dat file values everytime. Is there any other settings that needs to be changed?

I am creating scripts for Oracle VUs