Timesheets MTS - No Period Defined for This Date

In most parts of the world it is now 2013. This means in a lot of cases you may find that when you try to add activity to a project in Timesheets MTS that you get a message box popping up saying:

No period is defined for this date.
Someone with Super User privileges must define a period covering this date

By default for the last year the software created a single period covering all of 2012. Now that we are in 2013 this has expired and you must create a new period. To do this just log into Timesheets MTS as a super user and go to the Tools->Options->Periods menu and add some new periods covering the coming year (or several years if you like).

For your reference you can make use of periods to stop forward posting by users or to stop users editing data in previous periods.