...
Note: a one off task requires a cardinal time step and a reference time to establish a correct T0 for the run. The cardinal time step is important as it also controls how often the master controller will run an instance of the task if triggered by and event (it will only run once every cardinal timestep, even though there are multiple events in that period); it is recommended to set this to 1 second if the action should be executed for every event code (e.g. in the case of sending alert messages). This can be increased if is not desirable to executed several workflows in a short period (e.g. the case of creating web reports). It also needs the "template task" with the relevant tag scheduled (in suspended mode) as a singe/one-off task.
Related information on Event-codes
See |Event-codes|https://publicwiki.deltares.nl/display/FEWSDOC/Admin+Interface+System+Status+Event+Codes|