I have a roles hierarchy like in the image attached. One Sales Manager and UNDER this role, two other roles: Sales_Europe and Sales_US. Assigned to these two roles, i have two users: user_a (Role: Sales_US) and user_b (Role: Sales_EU). THE OWD is set on PRIVATE for all objects and the Grant Access Using Hierarchy set on ON to all.
I do have Professional License.
I would like that Sales_EU does NOT see the accounts they do NOT own. (Unfortunatelly the user_a sees the contacts they do not own.)
The question: HOW can I enforce this security model? TIA