Possible causes and solutions are in this link Aggregate Storage Errors that contains:
1060172 Aggregate storage outlines only allow any shared member once in a stored hierarchy, including prototype.
A stored hierarchy in a dimension where multiple hierarchies are enabled contains either:
- A non-shared instance of a member and a shared instance of that member.
- Two shared instances of the same stored member.
Be sure that stored hierarchies in dimensions with multiple hierarchies enabled do not contain two shared instances of the same member or one non-shared and one shared instance of the same member.