The junction is not set as the default for the edge-junction rule after the following actions have been taken:
1. Establish an edge-edge connectivity rule. 2. Set the junction as the default for the edge-junction rule that was implicitly created when the edge-edge rule was established. 3. Click OK. 4. Re-open the Geometric Network Properties dialog box.
Workaround
Click 'Apply' after setting the edge-edge connectivity rule.
Right-click the junction class in the 'Subtypes in the Network' tree view to set it as the default.
Click 'Apply'.
Click 'OK' to dismiss the dialog box.
The junction is set as the default for the specific edge-junction connectivity rule.