I am using a "Submit a form from previous request" to use the form details of the previous response in the current request. But I could see <FORM VALUE> is not getting extracted instead "NA" is getting filled up. Any possible solutions ?
The "NA" means that the value cannot be extracted in the previous form that you have chosen. It's difficult to tell more without the form definition in your response and the POST request. Have you checked if another form from the response should be picked up?
If the value can't be extracted automatically you can also manually extract it.