Cause

Each interruption point must have at least one counterpiece as a further interruption point that has a relationship via a cross-reference with the first interruption point. This cross-reference is formed when both interruption points have the same device tag. In the concrete case there is no corresponding counterpiece to the interruption point used in the project since no cross-reference could be formed. Possibly the device tags of both interruption points were entered in different ways. When you added the device tag of the first interruption point to the schematic, you entered it in the "normal" way under Displayed DT in the Property dialog. By contrast, you entered the same device tag at the second interruption point in the Full DT dialog and in the process entered the identifier character as well as the counter together in the Identifier field.

Solution

1. Locate the interruption points in the schematic by means of the Go to (graphic) functionality offered by the popup menu in the Message management dialog.
2. Call up the property dialog respectively of both interruption points.
3. Click [...] next to the Full DT field in the Property dialog.
4. In the following dialog enter the identifier and the counter separately in their own fields in the DT table.
5. Confirm your entries.
6. Update the connections.
7. If required, start a new check run.