Duplicate value problem for a table in a SSAS Tabular model - SSAS 2012

Hi,

in a table of a SSAS Tabular model I've a descriptive column that I use to create a relation with a fact table. This column have some values that initiate by a word plus a space and other words, but however has different values and not duplicated values.

Fe this column has:

1. AAA

2. AAA BBB

3. AAA BBB CCC.

When I try to process the model I've an error because the value "AAA" is a duplicate one.

Any suggests to me, please? This scenario shouldn't represent an issue.

Thanks