Q.: Why aren't the labels displayed for Item Flows in Internal Block Diagram (IBD) diagrams?
A.: In some cases, in Internal Block Diagrams (IBD) and other diagrams, labels are intentionally not displayed to avoid a negative impact on diagram layouts. When conveyed items are created in new or existing diagrams, they are displayed automatically throughout the diagrams and can be displaced.
For the information about how to display the conveyed items, see Setting an Information Flow.