Menu: Data->Data units
Data units refer to the units defined in the problem. This option only appears if the problem type loaded has units defined.
You have to declare the length units of the current model and the unit system to be used when writing coordinates and data properties in the calculation file (values will be converted from the current units to the selected system units).
It is possible to set a user-defined unit system, but this feature can be disabled (see Unit System file (.uni) from Customization Manual).