Problem of proxying Vendor Specific Attributes (VSA)!

Hi! When i receive an access-reject from the radius server (this packet has VSA ), the proxy send back the access-reject to the client but delete the VSA. I tried to modify the file "attrs" by specifying "Vendor-Specific == xxx (our vendor number)" but it doesn't work and i'm not sure if it is the good file to modify. What can i do to indicate the proxy not deleting the VSA when it receive an access-reject from the server? Thanks a lot! ** * *