diff --git a/spine/feature_local_test.go b/spine/feature_local_test.go
index f6d12df..4765a5e 100644
--- a/spine/feature_local_test.go
+++ b/spine/feature_local_test.go
@@ -44,8 +44,8 @@ func (s *LocalFeatureTestSuite) BeforeTest(suiteName, testName string) {
 	_, s.localServerFeatureWrite = createLocalFeatures(s.localEntity, s.subFeatureType, s.serverWriteFunction)
 
 	remoteDevice := createRemoteDevice(s.localDevice, s.senderMock)
-	s.remoteFeature, s.remoteServerFeature = createRemoteEntityAndFeature(remoteDevice, 1, s.featureType)
-	s.remoteSubFeature, _ = createRemoteEntityAndFeature(remoteDevice, 2, s.subFeatureType)
+	s.remoteFeature, s.remoteServerFeature = createRemoteEntityAndFeature(remoteDevice, 1, s.featureType, s.function)
+	s.remoteSubFeature, _ = createRemoteEntityAndFeature(remoteDevice, 2, s.subFeatureType, s.serverWriteFunction)
 }
 
 func (s *LocalFeatureTestSuite) TestDeviceClassification_Functions() {
diff --git a/spine/function_data_cmd.go b/spine/function_data_cmd.go
index 850e915..3118454 100644
--- a/spine/function_data_cmd.go
+++ b/spine/function_data_cmd.go
@@ -62,23 +62,23 @@ func (r *FunctionDataCmd[T]) NotifyOrWriteCmdType(deleteSelector, partialSelecto
 }
 
 func filtersForSelectorsElements(functionType model.FunctionType, filters []model.FilterType, deleteSelector, partialSelector any, deleteElements, readElements any) []model.FilterType {
-	if deleteSelector != nil || deleteElements != nil {
+	if !util.IsNil(deleteSelector) || !util.IsNil(deleteElements) {
 		filter := model.FilterType{CmdControl: &model.CmdControlType{Delete: &model.ElementTagType{}}}
-		if deleteSelector != nil {
+		if !util.IsNil(deleteSelector) {
 			filter = addSelectorToFilter(filter, functionType, &deleteSelector)
 		}
-		if deleteElements != nil {
+		if !util.IsNil(deleteElements) {
 			filter = addElementToFilter(filter, functionType, &deleteElements)
 		}
 		filters = append(filters, filter)
 	}
 
-	if partialSelector != nil || readElements != nil {
+	if !util.IsNil(partialSelector) || !util.IsNil(readElements) {
 		filter := model.FilterType{CmdControl: &model.CmdControlType{Partial: &model.ElementTagType{}}}
-		if partialSelector != nil {
+		if !util.IsNil(partialSelector) {
 			filter = addSelectorToFilter(filter, functionType, partialSelector)
 		}
-		if readElements != nil {
+		if !util.IsNil(readElements != nil) {
 			filter = addElementToFilter(filter, functionType, readElements)
 		}
 		filters = append(filters, filter)
diff --git a/spine/helper_test.go b/spine/helper_test.go
index 1030d64..3a04a75 100644
--- a/spine/helper_test.go
+++ b/spine/helper_test.go
@@ -197,12 +197,22 @@ func createRemoteDevice(localDevice *DeviceLocal, sender api.SenderInterface) *D
 	return remoteDevice
 }
 
-func createRemoteEntityAndFeature(remoteDevice *DeviceRemote, entityId uint, featureType model.FeatureTypeType) (api.FeatureRemoteInterface, api.FeatureRemoteInterface) {
+func createRemoteEntityAndFeature(remoteDevice *DeviceRemote, entityId uint, featureType model.FeatureTypeType, functionType model.FunctionType) (api.FeatureRemoteInterface, api.FeatureRemoteInterface) {
 	remoteEntity := NewEntityRemote(remoteDevice, model.EntityTypeTypeEVSE, []model.AddressEntityType{model.AddressEntityType(entityId)})
 	remoteDevice.AddEntity(remoteEntity)
 	remoteFeature := NewFeatureRemote(remoteEntity.NextFeatureId(), remoteEntity, featureType, model.RoleTypeClient)
 	remoteEntity.AddFeature(remoteFeature)
 	remoteServerFeature := NewFeatureRemote(remoteEntity.NextFeatureId(), remoteEntity, featureType, model.RoleTypeServer)
+	remoteServerFeature.SetOperations([]model.FunctionPropertyType{
+		{
+			Function: util.Ptr(functionType),
+			PossibleOperations: &model.PossibleOperationsType{
+				Read: &model.PossibleOperationsReadType{
+					Partial: &model.ElementTagType{},
+				},
+			},
+		},
+	})
 	remoteEntity.AddFeature(remoteServerFeature)
 
 	return remoteFeature, remoteServerFeature
diff --git a/spine/nodemanagement_test.go b/spine/nodemanagement_test.go
index 6079739..93e41f2 100644
--- a/spine/nodemanagement_test.go
+++ b/spine/nodemanagement_test.go
@@ -21,7 +21,7 @@ func TestNodemanagement_BindingCalls(t *testing.T) {
 	_, serverFeature := createLocalFeatures(localEntity, featureType, "")
 
 	remoteDevice := createRemoteDevice(localDevice, senderMock)
-	clientFeature, _ := createRemoteEntityAndFeature(remoteDevice, bindingEntityId, featureType)
+	clientFeature, _ := createRemoteEntityAndFeature(remoteDevice, bindingEntityId, featureType, "")
 
 	senderMock.On("Reply", mock.Anything, mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
 		cmd := args.Get(2).(model.CmdType)
@@ -94,7 +94,7 @@ func TestNodemanagement_SubscriptionCalls(t *testing.T) {
 	_, serverFeature := createLocalFeatures(localEntity, featureType, "")
 
 	remoteDevice := createRemoteDevice(localDevice, senderMock)
-	clientFeature, _ := createRemoteEntityAndFeature(remoteDevice, subscriptionEntityId, featureType)
+	clientFeature, _ := createRemoteEntityAndFeature(remoteDevice, subscriptionEntityId, featureType, "")
 
 	senderMock.On("Reply", mock.Anything, mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
 		cmd := args.Get(2).(model.CmdType)
diff --git a/util/helper.go b/util/helper.go
index b67faff..2e0eee0 100644
--- a/util/helper.go
+++ b/util/helper.go
@@ -2,6 +2,7 @@ package util
 
 import (
 	"encoding/json"
+	"reflect"
 )
 
 // quick way to a struct into another
@@ -9,3 +10,19 @@ func DeepCopy[A any](source, dest A) {
 	byt, _ := json.Marshal(source)
 	_ = json.Unmarshal(byt, dest)
 }
+
+// checck if a value is nil for any type
+func IsNil(data any) bool {
+	if data == nil {
+		return true
+	}
+	switch reflect.TypeOf(data).Kind() {
+	case reflect.Ptr,
+		reflect.Map,
+		reflect.Array,
+		reflect.Chan,
+		reflect.Slice:
+		return reflect.ValueOf(data).IsNil()
+	}
+	return false
+}