How to avoid using of a concrete legato sample from all other keys?

Strange.

I have only one imported legato sample - F4 to C4, mapped on C4. By playing F4 and C4 it works as expected. Expected was also that only this sequence shall trigger the F4-C4 sample. But no. Any other key, followed by C4 uses the same legato sample.

How shall this be fixed? By special name? What is the default Halion naming way for true legato?

Just for info, my F4-C4 legato sample’s name is Layer4_LEG_RR1_F4-C4.

Thank you guys for the advise(s).