I have a problem that I dont understand, I try to add a second hierarchy to the a time dimension but no matter what or how I do it I get this error when i try to process the dimension "Item has already been added, Key added." No matter how I define the Level property I get this error.
I´m working on BPC 10 MS , it is a standalone machine.
See the pictures below on how it looks .
Grateful for any help!