[V4MD 2.0.2] binaryLink: how do not allow duplicates

[info at vallemediatime.com]

Ruslan, 
a few day ago you tell me
>>BTW, right now binaryLink do not allow duplicates.
>>So it should work as you want.

I've tried with this code, 

T1 = value(member("A").text)
T2 = value(member("B").text)
link = gDb.link("link_person_phone")
if CheckValError() then exit
link.linkRecords(T1, T2)

and I can duplicate links and I don't see error message...
I must do not allow duplicates link instead.
Paolo
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