diff --git a/usecase/fishbone_usecase.go b/usecase/fishbone_usecase.go
index f23101e..fa01e0e 100644
--- a/usecase/fishbone_usecase.go
+++ b/usecase/fishbone_usecase.go
@@ -101,7 +101,7 @@ func (u *fishboneUseCase) CreateFishbone(fishbone req.FishboneDTO) error {
         }
 
         // Validate port availability
-        if startDevicePort.PortAvailable < 1 {
+        if startDevicePort.PortAvailable < 1 && startDevice.DeviceType == "ODP" {
             return fmt.Errorf("start device has no available ports (available: %d, required: 1)", 
                 startDevicePort.PortAvailable)
         }