FileMaker 13, OS X 10.10
I am saving a FileMaker record to a PDF via a FM script. The default printer settings for the computer are set to a default page size of A4 in the system preferences. In FileMaker the page setup default is set to A4. In my FM script there is a page setup step before making the PDF, and in it the page size is set to A4 at 90%. I use the "Save Records as PDF" script step. My PDF comes out at a page size that is about 10% larger than A4 (9.18 x 12.99 in).
What are the possible causes?