OS/2 Warp 4.5 IDE/SCSI-Controller issue

Hey Pals, I lately tried to install the Retro OS/2 Warp Server 4.52 in a Parallels VM and got stuck on the Installation in several points, even if it's listed as supported. First of all, the Boot-CD was not detected after choosing, what was no problem at all. CD2 booted and was running well until I had to choose the Harddisk, which I tried in several GB's up to 8 GB and with IDE and SCSI-Controller-Option, but none was working. The IDE-Controller simply was not detecting anything except the CD-Drive while SCSI leads into an "Error 9", without further description but only SCSI-Controller as true reason. So something seemed to have been lost with all new editions of Parallels at all, even if OS/2 is really not actual anymore. Maybe you could fix just anyway. Would be great... Thanks!