Multi Refenrece Link that I can Choose the Same Option Twice

בס"ד

Right now, If I have a Multi Refenrce link in a collection with the name, Units of Measurement (which contains different units of measurement) if I want to choose the same unit twice or more for a certain ingredients in a Recipe on a cooking site, I can’t do that, because once a multi reference link is chosen (such as Kg in this case), it disappears from the list.
It would be very useful to me to be able to rechoose the same link.

Thanks.
Yoram