Get externalCalibrationLastTime

Hi,

I use "nisyscfg.h" library,

I can't get the property data "NISysCfgResourcePropertyExternalCalibrationLastTime", the return struct data are all "0",

but i can get the property data "NISysCfgResourcePropertyInternalCalibrationLastTime", the return data have value. why ?

is the library version issue ?

Thanks.