2013 Frequency, coded Desc: Code specifying interval grouping of the delivery, production, etc. of the schedule. Repr: an..3 A Annually (calendar year) Code defining a yearly forecast. B Continuous Flexible frequency scheduling based on continuous consumption of items. C Synchronous Flexible frequency scheduling based on synchronous consumption of items. D Discrete Flexible frequency according to planning process. E Replenishment Flexible frequency scheduling based on replenishment of the consumption of items. F Flexible interval (from date X through date Y) Code defining a forecasted usage that is planned between two defined dates. J Just-in-time Self explanatory. M Monthly (calendar months) Code defining a forecast by calendar month(s). Q Quarterly (calendar quarters) Code defining a forecast by calendar quarter(s). (Jan-Mar, Apr-Jun, Jul-Sep, Oct-Dec). S Semi-annually (calendar year) Code defining a forecast for the first six months of the year or the second six months of the year. T Four week period (13 periods per year) Code defining a forecast for four week intervals. W Weekly Code defining a forecast for weekly intervals. Y Daily Self explanatory. ZZZ Mutually defined Code reserved for special trading partner requirements when pre-defined codes do not exist.