Uniqueness violation when changing label

[tyody]

I have a level in a hierarchy that uses a code as the source and a description as the label.  I changed the description name (label) but kept the code the same and got a uniqueness violation.  Why would this cause a uniqueness issue if the code remained the same?  I have the label refresh property checked. 

[COGNOiSe administrator]

So the category code is forced to some unique value?

[tyody]

The code is unique because it is part of an alternate drill down path.  I'm fine with the code being unique - but why would I get a uniqueness violation if the only thing that changed was the label? 

[COGNOiSe administrator]

It shouldn't. That's why I am surprised too. Could you attach a screenshot of properties for the level causing uniquness violotaion?