loadrunner unable to find the...

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You can't use the request itself to find the value. It should come from a previous server response. Check each step back from the POST, or simply CTRL-F from the beginning, and look for the earliest appearance of the value from your recording.
 
Boris Kozo and Shane Evans, Thank you very much for the information. I am unable to find this ID in any of the responses before this request. This might be an ID that is being generated on the client side and sent to the server.
 
This in most probability is your DSID....can you enable the Flex rules under Rule Engine and scan for correlations?
 
Per Santosh's suggestion above, if you cannot find a manual correlation solution then absolutely do not rely upon an automated one. When it fails then you will be completely unable to troubleshoot why the failure occurred.
 
We've often had to pull back and use the dll's under Flex to generate those client side id's. Sometimes that's the only way, unless you can completely reverse engineer and implement the javascript or system calls within the C script as functions.