1. A document re-entry system comprising: a transport system having a track along which documents are fed substantially in a feeding direction by an associated feed mechanism; reading means positioned at said track in operative relationship with said documents as they are fed along said track so as to read therefrom data associated with each said document; said reading means including means to determine whether the data read from each said document is complete or incomplete with respect to predetermined criteria and to produce corresponding complete and incomplete signals, respectively; diverting means positioned along said track for diverting into a reject area those of said documents having a said incomplete signal associated therewith; processing means for processing said data read by said reading means and for controlling said diverting means; said processing means including: storing means for storing said data read from said documents and also for enabling said data read to be distinguished as complete or incomplete with regard to the associated documents; means for completing data for those documents having an incomplete signal associated therewith, and comprising: an imaging apparatus positioned along said track downstream along said feeding direction from said reading means to produce digitized image data of each said document passing thereby; data development means including a memory for storing said digitized image data, a display and a keyboard; and interface means for interfacing said processing means with said date development means to enable said data for a document having an incomplete signal associated therewith to be viewed on said display along with an image for said document derived from the associated digitized image data from said memory to enable an operator to key in additional data on said keyboard to thereby complete the data forming completed data for said last-named document; said completed data being transferred from said data development means to said storing means via said interface means and said processing means upon actuation of a transfer key on said keyboard while the associated said last-named document is in said reject area; said reading means including a reader for reading magnetic ink character recognition or MICR data; and said storing means including a first memory for storing said data read by said reading means for all said documents fed along said track and also including a second memory for storing said completed data for those said documents having a said incomplete signal initially associated therewith.