Call functions in 4.3a

Hi

I created an interpolation fonction in the global definitions node. I need to use that function as an excitation in a bondary condition and simulate according to that interpolation. So, I put "Int1" (without brackets) in the according space in the BC node. But, it appears with the orange color and I've got an error message telling me that Comsol doesn't understand the included function. I searched in the forum to no avail and the docs related to that point are quite vague concerning the calling of the functions.

How should I do to correctly call this type of functions in the simulation ?

Thanks a lot