Thanks vmanolova
Can you also help with the last part; i.e. I am facing an error if the web_custom_requestis inside web_concurrent_start and web_concurrent_end e.g.
//1
web_concurrent_start
//2
...
...
web_custom_request
...
...
web_concurrent_end
I have tried placing web_reg_save_param_xpath in place of //1 and in place of //2 above but same error; Also, tried RequestURL in SEARCH_FILTERS but same error. And, if web_concurrent_* are commented then it works fine.