Currently, there is not line threshold to be set on Production order or Kanban Wave templates. Given the fact that Wave-processing results in critical long running transactions, if waves have more than 500 lines, there should be threshold definable, else there is a risk of servere performance problems while wave processing and work creation is running. You might argue, that you can create one wave per order - but if production orders or kanbans are produced for single piece flow, that would mean one wave to pick per piece - that model is not scalable either !! .