Hi, it's an issue that exists for many years and it hasn't changed in Mac OS Lion. If I perform printing in A4 the margins (no printable area) are automatically 0.63 cm on the left, the right and the upper side but on the lower side the margin is 1.45 cm. It seems that the printable area is the same like in US letter format.
To solve this problem I create a custom format named 'A4complete' with 0.63 margin on every side and use this format in every print script. But it is not comfortable to tell all my users to create this format before using my FileMaker solutions.