PropertyHandle :: CheckUpdate - Can instance be updated
The function returns an error (YES), when no instance is selected or when the selected instance cannot be updated.
Return value:  Success ( logical  )
Implementation details
logical 
PropertyHandle  :: CheckUpdate ( logical check_update=YES )
- check_update
 - Check update
When this option is set to true, the function checks, whether the property can be updated or not. Otherwise, the value is set without checking. Default: YES
 

