Hi after reading the conclusion of this thread : https://forums.oracle.com/forums/thread.jspa?threadID=559455 I decided to search the support KB, but KB is down at the moment :
Multiple shared members in ASO outline
Posted: 15 mai 2006 15:11 in response to: Guest
I heard back from Hyperion Tech Support again. Turns out it's not a defect after all. It's actually a subtle technicality in the restrictions on shared members with ASO. The first restriction, which is explained in the outline verification error message, is that you can only have one instance of a shared member within a given stored alternate hierarchy. The second restriction is that you cannot have any shared members within a given stored alternate hierarchy where the non-shared instances of the members are ancestors/descendants of each other. Unfortunately, when this restriction is violated, EAS gives the same error message as it does for the first restriction, so it's a bit harder to debug.
Hope this saves someone some grief.