Apple II Merlin MON mode

Hello, 

for my DISK II project, I need to write some ASM code on Apple II to simulate various disk protection mecanism (as per TOME  OF Protection), 

Running  a VIRTUA II emulator on my mac with an Apple //e image and Merlin 2.58, I started entering the BELL demo program:

* DEMO

     ORG $300

BELL EQU $FBDD

START JSR BELL

END RTS

I can compile with ASM, save the source and the object file, but I am struggling with the MON mode in the editor

I should see the compiled code when I do 

* 300L

and it is not the case, 

I should as well be able to run it with 300G (but the code seems not to be there)

I have stricly followed the documentation but I must be missing something ? 

Thanks for your help

VIncent