Brio Migration

Hi, We are doing migration from Brio 8.3 to EPM 11.1.2.1 We are using Migration Utility to migrate Brio 8.3 to 11.1.2.1 So we installed 11.1.2.1 in Distributed environment with 2 schemas 1) for Shared Services and Registry 2) for Reporting and Analysis(IR) then in

hs_migration document it is mentioned that Users and groups in the source system are mapped to users and groups in Shared Services, and the information on this mapping is stored in the Reporting and Analysis Repository then if then when we are migrating whether we need to give first schema or second schema while mapping ?

Please advise Is it better to go with two schemas or one schema while configuring 11.1.2.1 ?