diff --git a/images/virtualization-artifact/pkg/common/sizing_policy/sizing_policy.go b/images/virtualization-artifact/pkg/common/sizing_policy/sizing_policy.go
new file mode 100644
index 0000000000..ae0be5d087
--- /dev/null
+++ b/images/virtualization-artifact/pkg/common/sizing_policy/sizing_policy.go
@@ -0,0 +1,31 @@
+/*
+Copyright 2025 Flant JSC
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package sizingpolicy
+
+import (
+	"fmt"
+
+	"github.com/deckhouse/virtualization/api/core/v1alpha2"
+)
+
+func FormatCoreFractionValues(cf []v1alpha2.CoreFractionValue) []string {
+	result := make([]string, len(cf))
+	for i, v := range cf {
+		result[i] = fmt.Sprintf("%d%%", v)
+	}
+	return result
+}
diff --git a/images/virtualization-artifact/pkg/controller/service/size_policy_service.go b/images/virtualization-artifact/pkg/controller/service/size_policy_service.go
index b07bc5eaac..c31126cb2e 100644
--- a/images/virtualization-artifact/pkg/controller/service/size_policy_service.go
+++ b/images/virtualization-artifact/pkg/controller/service/size_policy_service.go
@@ -25,6 +25,7 @@ import (
 	"k8s.io/apimachinery/pkg/api/resource"
 
 	"github.com/deckhouse/virtualization-controller/pkg/common"
+	sizingpolicy "github.com/deckhouse/virtualization-controller/pkg/common/sizing_policy"
 	"github.com/deckhouse/virtualization/api/core/v1alpha2"
 )
 
@@ -103,7 +104,7 @@ func validateCoreFraction(vm *v1alpha2.VirtualMachine, sp *v1alpha2.SizingPolicy
 	}
 
 	if !hasFractionValueInPolicy {
-		formattedCoreFractions := formatCoreFractionValues(sp.CoreFractions)
+		formattedCoreFractions := sizingpolicy.FormatCoreFractionValues(sp.CoreFractions)
 		return fmt.Errorf("VM core fraction value %s is not within the allowed values: %v", vm.Spec.CPU.CoreFraction, formattedCoreFractions)
 	}
 
@@ -224,11 +225,3 @@ func generateValidGrid(min, max, step resource.Quantity) []resource.Quantity {
 
 	return grid
 }
-
-func formatCoreFractionValues(cf []v1alpha2.CoreFractionValue) []string {
-	result := make([]string, len(cf))
-	for i, v := range cf {
-		result[i] = fmt.Sprintf("%d%%", v)
-	}
-	return result
-}
diff --git a/images/virtualization-artifact/pkg/controller/vmclass/internal/validators/default_core_fraction_validator.go b/images/virtualization-artifact/pkg/controller/vmclass/internal/validators/default_core_fraction_validator.go
index fe7bb45587..db76b96ce4 100644
--- a/images/virtualization-artifact/pkg/controller/vmclass/internal/validators/default_core_fraction_validator.go
+++ b/images/virtualization-artifact/pkg/controller/vmclass/internal/validators/default_core_fraction_validator.go
@@ -1,5 +1,5 @@
 /*
-Copyright 2024 Flant JSC
+Copyright 2025 Flant JSC
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -23,6 +23,7 @@ import (
 
 	"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
 
+	sizingpolicy "github.com/deckhouse/virtualization-controller/pkg/common/sizing_policy"
 	"github.com/deckhouse/virtualization/api/core/v1alpha2"
 )
 
@@ -51,8 +52,8 @@ func (v *DefaultCoreFractionValidator) validate(vmclass *v1alpha2.VirtualMachine
 		}
 
 		if !slices.Contains(policy.CoreFractions, *policy.DefaultCoreFraction) {
-			return fmt.Errorf("vmclass %s sizingPolicy[%d]: defaultCoreFraction %d is not in the allowed coreFractions list %v",
-				vmclass.Name, i, *policy.DefaultCoreFraction, policy.CoreFractions)
+			return fmt.Errorf("vmclass %s sizingPolicy[%d]: defaultCoreFraction %d%% is not in the allowed coreFractions list %s",
+				vmclass.Name, i, *policy.DefaultCoreFraction, sizingpolicy.FormatCoreFractionValues(policy.CoreFractions))
 		}
 	}