Merge branch 'develop' into 99-commit-confirm-mechanic-for-ond-changes

nucleus/principalNetworkDomain.go

@@ -51,7 +51,7 @@ func NewPND(name, description string, id uuid.UUID, sbi SouthboundInterface) (Pr
 		errChans:         make(map[uuid.UUID]chan error),
 	}
 	if err := pnd.sbic.add(sbi); err != nil {
-		return nil, &ErrAlreadyExists{item: sbi}
+		return nil, err
 	}
 	return pnd, nil
 }