If you want to set the property value to the value of an attribute, select Attribute value. Click the ellipsis button (...) and select a class or system attribute.
Note:
If the attribute value is null, a property is created with a blank value.
When configuring a System Task, the Previous check box is enabled. This option allows you to get the previous value of the specified attribute from the current object. If this option is not selected, the current value is used.