Question:
I have specified, that InterForm400 print out a merged spooled file in several copies, but it is only printed once.

Why?

Answer:

This is not a problem in InterForm400. The problem is related to remote writers (printing without a printer device on LAN printers).
You need to change the output queue, that you use for printing.

Change this parameter and the COPIES parameter of the spooled file will be respected:

Destination options: DESTOPT('XAIX')

(Use uppercase for the value).