Allignment

Hallo! This is my first post and my first question... I am really new to Trados!

I would like to create a TM from an Allignment of two documents... I completed the allignment (19/19  segments) but when I click " Import in TM" a message appears telling "0/19 allignment couples imported into TM. Only duplicates or disconnected segments were found".  

Do you know what this message means and what I can do to correct it and create my Tm from allignement? Thank you!!!

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