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Set the When To Evaluate property to On-read to generate a new random value to replace every unique recorded value. However, two identical recorded values will be replaced by the same data generator value on a single VU-iterationIteration.

For example, if you parameterize 4 recorded values "aaa", "bbb", "ccc" and "aaa" in your test case , then you can get corresponding data generator values "123", "456", "789", "123" on-iteration 1 and 987", "654", "321", "987" on-iteration 2. Note that the 1st and the 4th random values are the same (within one VU-iteration) because the 1st and the 4th recorded values are the same.

An alternative way to create the same type of parameterization is to create 3 data generators with the When To Evaluate property set to On-iteration: DG_aaa to parameterize 1st and 4th the recorded value, DG_bbb parameterize 2nd recorded value, and DG_ccc to parameterize 3rd recorded value.

However, n-iteration substantially simplifies parameterization since you can use a single data generator. It's beneficial when you need to parameterize multiple recorded values.