This tab is used to define the device class (printing press, cutter, etc.) to which this operation (PDC message) is to be automatically assigned. If, for example, you want this operation to be automatically assigned when defining printing presses, you have to assign the "Sheetfed press" entry to the "Allocated device classes" section here.
If you do not assign anything, this operation is assigned to each new device created.
When creating a new device, this operation is automatically assigned to the device through the operation group. The following figure illustrates this.
