Compatible and not compatible q-grid

[amolina]

Dear all,

I am working with the electron-phonon part of yambo, and sometimes, when I load the elph-files with ypp_ph, I get this message:

found 8 NOT Q-grid compatible

even I use identical k-grid and q-grid.

What is the criteria to define a Q-grid compatible? are they identical, multiple?

Thanks,

Alejandro.