How to HMR and copy the uri-user in FROM header and put it in PAID header?

   Hello everyone,


   We need to copy the uri-user value in FROM header to PAID header.

Below is the HMR created however it was not working. This HMR is added in out manipulation 

on Session Agent. Thank you in advance!
   

 header-rule

            name                                    natPAID

            header-name                             P-Asserted-Identity

            action                                  manipulate

            comparison-type                         case-sensitive

            msg-type                                any

            methods                                 

            match-value                             

            new-value                               

            element-rule

                    name                                    ValueTakenfromFrom

                    parameter-name                          

                    type                                    uri-user

                    action                                  replace

                    match-val-type                          any

                    comparison-type                         pattern-rule

                    match-value                             

                    new-value                               $FROM_USER.$0