A duplicate attribute key has been found when processing

Hi
When I process one of my dimensions it fails and I get the following error:
Errors in the OLAP storage engine: A duplicate attribute key has been found when processing: Table: 'Customers', Column: 'DisplayName', Value: 'Stephen Grant'. The attribute is 'Display Name'.
I don't know if this is significant, but the attribute to which it is making reference was added through BIDS 2008 (the cube was originally created with BIDS 2005). 
There are no duplicates of 'Stephen Grant' in the DisplayName column. Not that it should matter if there were as this attribute has a cardinality of Many, with an rigid attribute relationship directly to the dimension's key attribute. The Key column for the Display Name attribute simply refers back to the same (DisplayName) column in the table.
If I delete this record, or even just update the DisplayName field from 'Stephen Grant' to something else, the dimension processes just fine. I can't work out what it is about this record that is stopping the dimension from being able to process.
Can anyone help me figure out what's going on?
Julia.
P.S. I am using SSAS 2008 on Windows Server 2008

Hello there,
Does anybody has the complete resolution for duplicate entries data. I am showing the data below .
RegionName
BranchName
LoanOfficerFullName
PRIME - TEAM NORTHEASTERN
CALIFORNIA
ALONA  HAYES
PRIME - TEAM WESTERN
RENO-DAMONTE RANCH
VINCENT LOTITO
PRIME - TEAM WARTON
NEWARK (Chicago)
CHRISTOPHER CLIFTON
PRIME - TEAM WARTON
GRAND HAVEN (West Michigan)
SEAN  FOLEY
PRIME - TEAM SALMANS
LAWTON (Amarillo)
THOMAS  STEARNS
PRIME - TEAM BARTON
CALIFORNIA
ALONA  HAYES
PRIME - TEAM ROBINSON
LAS VEGAS
ANGELA DEATON
PRIME - TEAM ROBINSON
LAS VEGAS
HERMAN  VANDER VELDT
PRIME - TEAM ROBINSON
LAS VEGAS
DAWN ROBINSON
PRIME - TEAM ROBINSON
LAS VEGAS
MICHAEL  BIRK
 Here i have the Hierachies in order LoanOfficerFullName-->BranchName-->RegionName. Loan Officer is the lowest level. I had created another column and make that unique entries so that I could make the unique column as the Key and the hierachies i have linked with the key column value. The issue
is that i am getting the expected result in OLAP  from data side. But the data is not getting aggregated like Team Barton is coming twice though for the Dimension I make IsAggregatable property to True. If anybody can help me I will aprecciate. If any other clarification need I can provide.

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    http://blog.oraylis.de/2013/08/a-duplicate-attribute-key-has-been-found-during-processing-revisited/
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