[CQ-Contest] ARRL DX LCR - they remove Uniques?

[kr2q at optimum.net]

Maybe I'm just a mile out of touch, but I checked my LCR for the ARRL DX (cw) and I 
discovered that I lost a QSO (just one) because the QSO was flagged as a Unique.

I have scanned all of the ARRL rules (general, HF, specific to this contest) and I see no
mention of the word "unique" anywhere.  While I personally agree that 99% of uniques
worked by USA stations in a DX contest are actually busted calls, I am surprised to see
that I got dinged for this (unexpected).

Is this policy in the rules anywhere?  If yes, please point me to it (senior moment?).

thanks!

de Doug KR2Q