SSPeriodic
@Serializable
@SerialName(value = "sSPeriodic"
Periodic-review (s, S): every reviewInterval the policy checks the position and, if at or below reorderPoint, orders up to orderUpToLevel.
data class SSPeriodic(val reorderPoint: Int, val orderUpToLevel: Int, val reviewInterval: RVSpec) : PolicySpec(source)