problem in system alias in ESS.

Hi Experts,

I want to implement the Eseperation module in ESS in the sap portal (version 7.4) and ECC(EHP 7).we have already implmented the ESS but all the other services are WDJ services, we want to implement Eseperation using WDA.

I want to create the WDA iview of Eseperation(ESS) in my portal using the backend parameters in lpd_cust(system alias,applicaton name,configuration name ).

For Eseperation we have to use the SAP_ECC_HumanResource, but that alias was already used by the sytem object for travel management.

Can anyone tell me how can i create the WDA iview now in my portal????