This article describes about an error received when user tries to delete the SD-WAN interface.
FortiManager and FortiGate.
From the function Where Used is not displaying where the interface is being used.
To find exactly where the interface is, need to go through the features for SD-WAN itself, which is Performance SLA, Neighbor and SD-WAN Rules.
Especially in Performance SLA, where it does not display the interface.
After removed all the interface in related features, then it be able to delete the interface.
If received an error when to confirm the changes:
Can try to delete the interface from the FortiGate.