You have noticed that your Role Based Permission roles have a new role assigned to all users called "MDF Foundation Objects Value Help Read," but do not understand the purpose of this role.
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This role was added as a part of release b1511.
The role, MDF Foundation Objects Value Help Read, has been assigned to all users to provide view access to the "externalCode" and "name" fields of migrated Foundation Objects.
KBA , LOD-SF-EC-MDF , MDF & EC2MDF Migration , How To