The validation rule checks if the diagram displays symbols without their elements' Data Markings.
Elements (e.g. ports) and relationships whose names and/or types are displayed in labels have Data Markings added as prefixes in the labels. You can choose to either show or hide the labels via Symbol Properties. Hiding the label hides the added Data Marking, too, however, it does not remove the Data Markings from the element/relationship. A hidden label hides the added Data Markings and prompts the validation error.
The same applies to sensitive Conveyed Item labels of Item Flows realized on connectors. If the project option Show Data Markings in References is enabled, and such a label is hidden, the validation error is prompted.
Severity
warning
Constrained Element
Diagram
Solvers
Show Name - once selected, the element name is displayed along with the added Data Markings.
Show Conveyed Information - once selected, the label with the sensitive Conveyed Item of an Item Flow realized on a connector is displayed.
For some symbols, you can also resolve the error by displaying the element type via the Show Type Symbol Property.
Example
A diagram with a single port (on the left) and multiple ports (on the right) are displayed without the added Data Markings. The error is resolved by displaying the name label with the added Data Markings via the Show Name solver.