Can't cut in 4D Pop Xliff

We can’t use “Cut” shortcut in the text zone (we can hopefully use contextual menu) but why !?
Even in the edit menu the option is greyed ???

Tested on mac OS 10.14 with 4D 17.0 build 17.228795 in 32 bit
with 4D Pop Xliff (17R2 (96))