I am currently running into an issue on Free Flow Core 5.1.07 with regards to laying in a dynamic barcode for perforation for a 2up imposition on 18'' web paper. I need to put a barcode on both sides of the 18'' inch paper to drive dynamic perforation on both pages (2up). To handle the dynamic perforation codes - I am reading in bookmarks of the PDF. However, when a certain number of pages in the document generate an unequal imposition - meaning I only have one page on a 2up imposition - a barcode is not placed on the document and I generate errors during printing. As an example of what I mean - if I have a 10 page document. A barcode is placed on every page of the 2up imposition - except on the last page because the document is on the "right" side of the 2up imposition - and not the left. This causes a barcode to be placed on the "right" side of the imposition and not the "left". I suspect this is because there are no logical bookmarks for the system to key off of, but I am not sure what a solution for this would be.