"Allow duplicate specific transactions" checkbox functionality
All supported DevTest releases.
In VSI transactions, checking "Allow duplicate Specific Transactions" allows a round-robin selection of the specific transactions if the request data values are same.
If there are 2 specific transactions (ID's are 2 and 4) with same request data as "Name=John" and "HouseNumber=2234" and both can have different responses.
When a first transaction hits VS then VSE is going to send response from ID=2 and a second transaction hits VS then VSE is going to respond from ID=4.
When a third transaction hits VSE again then VSE is going to respond from ID=2 again.
Refer to section "Transactions Tab for Stateless Transactions" in the documentation of the DevTest release you are running.