Fabio,

If the object conditionally constructs then your WITH createobject() will throw an error. This code will not error:

myRef = createobject()
if ( vartype( m.myRef ) == "O" )
   with m.myRef
   endwith
endif

>You can explain the difference between a) and b),
>I do not see the impediment :
>A)
>

>myRef=CREATEOBJECT(...) && this fail
>   WITH M.myRef
>..
>

>
>B)
>

>WITH CREATEOBJECT(...) && this fail
>...
>

>
>I must capture the error and resolve it in both cases.