Create and register "OrdersPostProcessingEventHandler" which will create Pieces, link them to Items, trigger necessary logic in mod-finance and eventually set Order status to Open. Existing logic for creating Pieces and other functionality should be reused. DI_COMPLETED event should be issued for every POLine for which processing is finished. Add table to track processing of POLines associated with a particular Order (orderID, total POLines and a counter for POLines), once post processing event is received for each POLine in the Order, call Helper service for Order to be processed and opened, sent DI_COMPLETED event after that.

This handler should be invoked by a consumer that is subscribed to DI_ORDER_CREATED_READY_FOR_POST_PROCESSING event .

See the diagram https://folio-org.atlassian.net/wiki/display/DD/Import+Orders+in+MARC+format - this handler should cover logic specified in steps 12-18.