PBC 10 user users/teams/roles and access data profiles

Hello experts,

couples of questions with regards to BPC 10 security

1) In PBC 10, version SAP NetWeaver , if a team or a user was created in BPC not in BW, can the created user/team has access to SAP BW? Can the created team/user be imported and assigned assigned rights in BW?  Or , if I need a user who will have acces to both SAP BW and BPC , do I HAVE to create the user in SAP NetWeaver (BW) and assign rights?? or

2)

If the defined attributes are Currency=Euro: Read and Country=France: Write, then Entity102 is writable.

Assuming that a write access to Currency = Euro : Write produce the same output as in the above, How can ensure that I can give a write access on a dimension without having allowing the write access to the whole entity as in the above case?

Thanks

Jh