>>>>Add a m., and use vartype().

>>>>If vartype(yourunknown)#'U' and vartype(m.yourunknown)='U'
>>>>*  yourunknown is a field
>>>>else
>>>>*  yourunknown is a memvar
>>>>Endif

>>>
>>>Interesting solution.
>>
>>It's not 100% safe, it will also report that an object is a field.
>
>I don't see a problem with the object here. For me this looks like a safe code.

yourunknown = CREATEOBJECT([EMPTY])
? VARTYPE(m.yourunknown)

Just because objects are memory variables also.