If you set the member key to time_id but do not change the member name column (also to time_id) you will create a situation where multiple members of the same parent have the same name - this is not allowed and results in the 'duplicate member' error you are receiving.
If you consider this for a moment, you'll see why: since the grain of time is day, many time rows (with unique time_id values) have the same Month value.
Scot Reagin
sreagin@aspirity.com
Scot J Reagin
sreagin@aspirity.com
Scot J Reagin
sreagin@hitachiconsulting.com