maxpat in poly~ in m4L midi device freeze/embed problem..

Hello..
Sorry to bother you all but every solution I found in the forum doesn't solve my problem..
..I should miss something simple

I am making a m4L device with a poly~ containing a "xxx.maxpat"
I am making this device in Live, not directly in Max.

Here it's the procedure I am doing.

-my device is in edit mode in Live
- in the poly's inspector "Patcher Files" I choose my "xxx.maxpat"
- this "xxx.maxpat" is in the same folder that my device (...document/m4L/UserLibrary)
- the path "...document/m4L/UserLibrary " is in the search path of Max
- I freeze the device
- I save the device
-max console says :
"freezing device...
Adding file xxx.maxpat
freeze complete"

- I close the device
- the device doesn't work at all (it's working perfectly just before I closed the edit mode)
- I reopen the device and the poly~ object is empty with no xxx.maxpat in the patcher files inspector...

Any idea ?

Thank you !

Julien