Used when some Work Items may need to interrupt other Work Items at an Activity.
The priority label is called PRIORITY and you can add this to your simulation in the same way as any other label. If a Work Items does not have this label then it is said to have zero priority (i.e. the same priority as a Work Item that has the label, and has it set to zero.)
The higher the value of the priority label, the more priority the Work Item has.
This label should not be confused with other methods to prioritize work. For example you can prioritize Work Items in a queue using any label.
Must be a number label.