Rewrite profile statistics in ltm

Hi, when I run the command I always get the same:

L4 Statistics:
------------------------------------------
    Client Request Bytes:   0
    Client Response Bytes:  0
    Server Request Bytes:   0
    Server Response Bytes:  0

L7 Statistics:
------------------------------------------
    Client Requests:        0
    Client Responses:       0
    Server Requests:        0
    Server Responses:       0

So, I can´t know if the profile is doing anything. Any ideas?

Thank you.