[Gate-users] warning in ARF running

[Saeed Heidary]

Dear GATE users
I am running ARF example of GATE. During the 3rd mac file(useARFTables.mac)
this warning appears ;

[Acquisition-0] Slice 0 from 0 to 37.5 s [slice=37.5 s], final stop at 600
s.
### WARNING: G4UrbanMscModel90 model is used for e- !!!
###          This model should be used only for heavy particles

Nobody encountered such a warning,is it serious or not.
Moreover I have seen this many times in SPECT simulation.
Many thanks