diff --git a/api/v1/redkeycluster_types.go b/api/v1/redkeycluster_types.go
index 4a9774b..2ae84bf 100644
--- a/api/v1/redkeycluster_types.go
+++ b/api/v1/redkeycluster_types.go
@@ -161,6 +161,7 @@ func (redkeyCluster RedkeyCluster) GetLabels() map[string]string {
 // RedkeyClusterSpec defines the desired state of RedkeyCluster.
 // +kubebuilder:validation:XValidation:rule="self.ephemeral || has(self.storage)", message="Ephemeral or storage must be set"
 // +kubebuilder:validation:XValidation:rule="!(self.ephemeral && has(self.storage))", message="Ephemeral and storage cannot be combined"
+// +kubebuilder:validation:XValidation:rule="!(!self.ephemeral && self.purgeKeysOnRebalance == true)", message="Cannot set purgeKeysOnRebalance to true for non-ephemeral clusters"
 type RedkeyClusterSpec struct {
 	// +kubebuilder:validation:Optional
 	// RedisAuth
diff --git a/config/crd/bases/redis.inditex.dev_redkeyclusters.yaml b/config/crd/bases/redis.inditex.dev_redkeyclusters.yaml
index e491259..bb1c2c1 100644
--- a/config/crd/bases/redis.inditex.dev_redkeyclusters.yaml
+++ b/config/crd/bases/redis.inditex.dev_redkeyclusters.yaml
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2025 INDUSTRIA DE DISEÑO TEXTIL S.A. (INDITEX S.A.)
+# SPDX-License-Identifier: Apache-2.0
+
 ---
 apiVersion: apiextensions.k8s.io/v1
 kind: CustomResourceDefinition
@@ -7761,6 +7764,8 @@ spec:
               rule: self.ephemeral || has(self.storage)
             - message: Ephemeral and storage cannot be combined
               rule: '!(self.ephemeral && has(self.storage))'
+            - message: Cannot set purgeKeysOnRebalance to true for non-ephemeral clusters
+              rule: '!(!self.ephemeral && self.purgeKeysOnRebalance == true)'
           status:
             properties:
               conditions: