[otrs] What is "Select source" at the AdminCustomerUser

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Nice new rich feature, otrs1.2.1!
(BThanks very much for developers effort.
(B
(BOne question.
(BAt the top of the AdminCustomerUser form , "Select source" appear.
(BWhat is this?
(B
(BIn my test site, only 'No name'.
(B
(BWhat does the word 'source' mean?
(B
(BThanks.
(BShozo
(B
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