A one time only service is the kind of service that is created when you click the New Service button in an existing schedule -- it just takes place on one, single date. One time only services may not be used in the preferences or can't serve times sections of volunteers' profiles. A yearly service is a service created in the Service Times pane after clicking the New Yearly button. These services can be added as preferences or used in the can't serve times section of volunteers' profiles.
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