Incorrect print quantity sent to printer for booklets

[r.blake]

Have another problem with this

Example: 16 pages, 2-sided, format A4, printed on SRA3 page, Page order: Repeated

$FFwfJob.printQuantity$ is specified as 15

On the printer I get Print Quantity: 4, while is should be 8

What is weird is that another file, in the exact same format, gets the correct print quantity.

[r.blake]

I am specifying print quantity in a script using $FFwfJob.printQuantity$ variable,

and with an imposition of Page order: Repeated, the correct quantity is being sent.

However, when I try to send a folded booklet to print with a Page order: Signature layout, I get an incorrect print quantity.

Example: 4 pages, 2-sided, format A4, printed on A3 page, Page order: Signature

The result of an imposition is 1 booklet per sheet, so the print quantity should be the exact same on the printer as I specified initially - the result however is halved for some reason.

If I specify print quantity 200, I get 100 as the number of copies on the printer. Why? How to fix it?