When performing tests, some values like Session ID, Time Stamp and others may be dynamically generated and affect future test recording as your application considers this as a repeat visitor.
The testing software may use these dynamically set values for recording and erroneously playback the previous activities (instead of new test scenarios).
As a result, you should be aware of these dynamic values that are specific to your application and ensure that each new test script is generating the appropriate results.
One common approach to solving this problem is through co-relation and dynamic data management while scripting.
Different testing tools use different approaches to handling dynamic content. For instance, JMeter uses Regular Expressions to handle dynamic content on web pages. Click here for more information on how to use regular expressions in JMeter.
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