Use one virtual server and select http service in two server policy

In fortiweb reverse proxy mode I have one virtual server (Vsrv) and I want to select this virtual server to transmit packets to multiple server pools (SRVp1, SRVp2). when I create server policy for Games department that contain SRVp1 web servers, I import Vrsv in virual server input box and select HTTP service, then when I create server policy for Finance department that contain SRVp2 web servers, I import Vsrv in virtual server input box and select HTTP service. after that I get following error: Two policies can not use the same Virtual Server and same Service   Question: Is there any solution to use a virtual server with http service transfer packets to multiple server pools?  Because I have one virtual server and want to use web servers 1-8 in SRVp1 for Games department and use web servers 5-8 in SRVp2 for Finance department.