OVRDBF from RPG

Hi All,
I'm writing a small test program to override a file within RPG like this :

DArray           S             31A              DIM(1) CTDATA
DCmd            S             31A
DLen             S             15     5

C                  MOVEA           Array(1)        Cmd
C                  Z-ADD             31                 Len
C                  CALL              'QCMDEXC'
C                  PARM                                 Cmd
C               PARM                                 Len
C                  SETON
LR
**
OVRDBF FILE(myfile) MBR(member2)

The program compile without error (crtbndprg). And run without any error
message too.
After I call the program from command line and DSPOVR it shows "No
override". 
Why no override happen ?
Hope some explanation (I'm on V3R2).  
Thank you
.

regards,
Ivan
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