SKIPROMMODULES is an alias for SKIPROMUPDATES, you can use only one at a time. If you want to skip multiple modules/updates, put them in quotation marks, seperated by commas.
For example
setpatch quiet skipromupdates "scsi.device,shell"
or
setpatch quiet skiprommodules "scsi.device,shell"
Both lines do exactly the same.
This does *not* work:
setpatch skipromupdates "scsi.device" skiprommodules "shell"