The key is already associated with an element of this collection.
CAUSE:
One possible cause for this error is the presence of two or more identical expressions in the attribute form of an attribute. This is a symptom of duplicate columns.
ACTION:
It is important to identify the root cause lead to the creation of the duplicate columns in the metadata in order to prevent it from happening again in the future.
Once duplicate columns are present, a ScanMD custom test is needed to merge them. Please contact Strategy Technical Support for further assistance with this.
KB416220
