I've got a number of documents that can be printed locally (simplex) by users or centrally (duplex) in order to take advantage of mailsort etc.  Unfortunately I'm having problems getting the pages to appear in the right place in the duplex queue.

The problem is due to the fact that the cover letters (1st page of document) are printed on Letterheaded paper, but any continuation pages use plain paper.  This means that assuming the page flows, the second page of the document needs to use the plain paper type for local prints (pre-sort) but the letterhead paper type for the post sort central print queue.

Not a problem, I thought, I'll use the Dynamic paper type field on the flow page template and set the variable to the correct value based on the customer data.

The cover letter page is simplex and set to "Starts on front matching paper types allowed on back"
The flow page is also simplex and set to "Starts on front or back, must match paper type"

I've added the paper types to the application object on the "Paper Types allowed for dynamic selection" tab and the outputs are set to Simplex for the local print and Duplex for the Central print.  The Duplex queue is the Primary queue in the application. I've added the variable used to control the Dynamic Paper Type to a text box on the flow page to make sure it's got the correct value and it has.  We're producing Postscript output on Version 6.1.025


I've tried setting the Dynamic Paper Type variable from Customer Timing Formula, Queue Rule and even setting it in the Control file, but everytime I get the following message:-

EX004047W (1) A blank back page was added to page (cover_letter_page) because the following page (flow_page) required a different
              paper type.

If anyone can spot anything I've missed I would appreciate it.