unique scenarios how to test load testing?

My web application having program name as unique field. Same program name should not be used by multiple numbers. While doing load testing I will record with program name as Program1 and generated the web test.

When I am calling this web test in my load test with 10 users all 10 users will try to create the program name as program 1. at this time validation message will come that program name entered is already exit in database. Pls choose another name.

Like this unique scenarios how to test load testing Pls let me know how to perform load testing in this case.

Thanks,

Shankar