Symfony2 using Multiuser Bundle and Alice Bundle

on my webproject I've been using the Hautelook Alice Bundle (https://github.com/hautelook/AliceBundle) to create my fixtures for dev and testing. For User Management I'm using the FOS UserBundle. My data file looked somewhat like this and it used to work perfectly fine:

AppBundle\Entity\StaffDetail:
  staffdetail_{1..5}:
    prefix: <title()>
    first_name: <firstName()>
    last_name: <lastName()>

AppBundle\Entity\Staff:
  staff_1:
    username: admin@example.com
    plainpassword: password
    email: admin@example.com
    mandant: @mandant_1
    enabled: true
    role: administrator
    staffdetail: @staffdetail_1
  staff_{2..5}:
    username (unique): <safeEmail()>
    plainpassword: password
    email: <identity($username)>
    mandant: @mandant_1
    enabled: true
    role: administrator
    staffdetail: @staffdetail_<current()>

Now I'm trying to have different login mechanisms for different user groups (staff and customers), so I want to use the Rollerworks Multi User Bundle (https://github.com/rollerworks/RollerworksMultiUserBundle).

I have created a new bundle for customers and staff and set everything up. When using the application everything works just fine. But generating the fixtures does not work anymore.

In the data file just namespaces changed.

Users\StaffBundle\Entity\StaffDetail:
  staffdetail_{1..5}:
    prefix: <title()>
    first_name: <firstName()>
    last_name: <lastName()>

Users\StaffBundle\Entity\Staff:
  staff_1:
    username: admin@example.com
    plainpassword: password
    email: admin@example.com
    mandant: @mandant_1
    enabled: true
    role: administrator
    staffdetail: @staffdetail_1
  staff_{2..5}:
    username (unique): <safeEmail()>
    plainpassword: password
    email: <identity($username)>
    mandant: @mandant_1
    enabled: true
    role: administrator
    staffdetail: @staffdetail_<current()>

When I run the fixtures command (or run the tests which also execute the generate fixtures command) it looks like it's trying to just insert the values into the database without running the FOS UserBundle constructor for the entity first, as the password, username_canonical, etc are not set.

[Doctrine\DBAL\DBALException]
  An exception occurred while executing 'INSERT INTO staff (username, username_canonical, email, email_canonical, enabled, salt, password, last_login, locked, expired, expires_at, confirmation_tok
  en, password_requested_at, roles, credentials_expired, credentials_expire_at, role, staffdetail_id, mandant_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)' with params ["ad
  min@example.com", null, "admin@example.com", null, 1, "kbttb26978gkkcosk404wccgc4os8wo", null, null, 0, 0, null, null, null, "a:0:{}", 0, null, "administrator", 22, 13]:
  SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'username_canonical' cannot be null

I'm stuck with this for a few days now, does anyone have any suggestions?

Thanks