inheritence with department - how should I design this ?

Hi,

I have the following department tree:

Direction

|_Service 1

|

|_Service 2

|     |_Department A

|

|_Service 3

|     |_Department B

|     |_Department C

I would like that when someone is affected to Service 3, then he is also a member of Departement B and C.

I tried my best to implement this behavior and I ended with 2 dynamic roles:

- a dynamic role on Department B saying that all person that belongs to Service 3 must belong to Department B

- a dynamic role on Department C saying that all person that belongs to Service 3 must belong to Department C

I'm almost sure this shouldn't be done this way but I can't figure out how this should be done.

Could you please help me on this ?

Thanks andbest regards,

Steph.