Cause
You created a terminal strip in the terminal strip Navigator or a function template in the schematic. You also created a terminal in the terminal strip Navigator or placed one in the schematic which is not a component of the function template.
Solution
Highlight the terminal strip definition in the terminal strip navigator or in the schematic. Go to Project data > Terminal strips > Edit. In the Edit terminal strip dialog go to the Popup menu and select the menu option Generate function template.
Now all terminals are components in the function template.
Refresh the connections and then start a new check run.