diff --git a/rw_core/mocks/adapter.go b/rw_core/mocks/adapter.go
index 6a8fb22..e14457d 100644
--- a/rw_core/mocks/adapter.go
+++ b/rw_core/mocks/adapter.go
@@ -259,3 +259,7 @@
 func (ta *Adapter) Start_omci_test(device *voltha.Device, request *voltha.OmciTestRequest) (*voltha.TestResponse, error) { //nolint
 	return nil, nil
 }
+
+func (ta *Adapter) Get_ext_value(deviceId string, device *voltha.Device, valueflag voltha.ValueType_Type) (*voltha.ReturnValues, error) { //nolint
+	return nil, nil
+}
diff --git a/rw_core/mocks/adapter_olt.go b/rw_core/mocks/adapter_olt.go
index 5f67da7..07077c8 100644
--- a/rw_core/mocks/adapter_olt.go
+++ b/rw_core/mocks/adapter_olt.go
@@ -332,3 +332,10 @@
 
 	oltA.flows = map[uint64]*voltha.OfpFlowStats{}
 }
+
+func (oltA *OLTAdapter) Get_ext_value(deviceId string, device *voltha.Device, valueflag voltha.ValueType_Type) (*voltha.ReturnValues, error) { // nolint
+	_ = deviceId
+	_ = device
+	_ = valueflag
+	return nil, errors.New("get-ext-value-not-implemented")
+}
diff --git a/rw_core/mocks/adapter_onu.go b/rw_core/mocks/adapter_onu.go
index 549e016..5f4a5e6 100644
--- a/rw_core/mocks/adapter_onu.go
+++ b/rw_core/mocks/adapter_onu.go
@@ -18,6 +18,7 @@
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"strings"
 	"sync"
@@ -240,3 +241,10 @@
 
 	onuA.flows = map[uint64]*voltha.OfpFlowStats{}
 }
+
+func (onuA *ONUAdapter) Get_ext_value(deviceId string, device *voltha.Device, valueflag voltha.ValueType_Type) (*voltha.ReturnValues, error) { // nolint
+	_ = deviceId
+	_ = device
+	_ = valueflag
+	return nil, errors.New("get-ext-value-not-implemented")
+}