SAPScript - Number of messages > 1 - wrong order

Morning experts,

one short question:

I tried to print out an invoice, number of messages = 2. When "Print immediately" is not marked (only held in spool), I will get one spool file with the original and the copy. Everything's fine.

When I mark "Print immediately" I will get 2 spools - one for the original, and one for the copy. Also fine.

But now comes the problem:

One printer print these 2 spool files in the correct order (first original, then copy), it's a Unicode printer (see note 750219). The other printer (HP8000N) prints first the copy, then the original...

What can be the problem?

Thanks

Michael