Why does BCM not detect duplicate contacts?

P

Pancras

I have an Outlook list of contacts with categories say A and B. I select all
contact with category A and copy and paste them to Business contacts in BCM.
Then I select the contacts with category B and paste. Why does BCM not detect
that some on the B list already exist after I copied the A list? The contacts
with both categories A and B appear twice instead of once with both
categories assigned. Can anyone help?
 
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