Thank for your answer David.
This is what I'll do.
________________________________
De : David G. Johnston <[email protected]>
Envoyé : 13 juillet 2020 19:46
À : Jean-Philippe Chenel <[email protected]>
Cc : [email protected] <[email protected]>
Objet : Re: Both side privileges

On Mon, Jul 13, 2020 at 4:42 PM Jean-Philippe Chenel 
<[email protected]<mailto:[email protected]>> wrote:
Hi,

I try to give userA privileges on userB objects and same thing to the userB, 
giving privileges on userA objects.

Grant userB to userA; —ok
Grant userA to userB; —error: role userB is already member of role userA

Create a "group role" that retains ownership and then add both users to that 
group.

David J.

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