Batchjob in ERP 6.0 wihtout spool requests or printouts

We recently upgrade our SAP R/3 4.6d to ECC 6.0

We have several batchjob that shoudl not print any reports after they are completed.

But in ECC 6.0 the Output Device is a mandatory field and we cannot keep it blank.

We have tried messing around with all setting in the print specification but the print keep on coming out.

How can I create a batchjob that does not throw a spool request/print.