diff --git a/package-lock.json b/package-lock.json
index 1ba6852c7..1b56f8521 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "passbolt-styleguide",
-  "version": "4.8.0-alpha.10",
+  "version": "4.8.0-alpha.11",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "passbolt-styleguide",
-      "version": "4.8.0-alpha.10",
+      "version": "4.8.0-alpha.11",
       "license": "AGPL-3.0",
       "dependencies": {
         "@testing-library/dom": "^8.11.3",
diff --git a/package.json b/package.json
index 55d7c29b7..5d6fb7060 100755
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "passbolt-styleguide",
-  "version": "4.8.0-alpha.10",
+  "version": "4.8.0-alpha.11",
   "license": "AGPL-3.0",
   "copyright": "Copyright 2023 Passbolt SA",
   "description": "Passbolt styleguide contains common styling assets used by the different sites, plugin, etc.",
diff --git a/src/shared/models/entity/abstract/entitySchema.js b/src/shared/models/entity/abstract/entitySchema.js
index eb98ea4c7..d83eebe71 100644
--- a/src/shared/models/entity/abstract/entitySchema.js
+++ b/src/shared/models/entity/abstract/entitySchema.js
@@ -119,11 +119,21 @@ class EntitySchema {
         continue;
       }
 
+      // check if propery is null
+      if (dto?.[propName] === null) {
+        // the prop is explicitly null, is it explicitly nullable?
+        if ((schemaProps[propName]?.nullable) === true) {
+          result[propName] = null;
+          continue;
+        }
+        // @todo: else => props is not nullable and null we could set an error and then continue but it requires all schema to migrate to explicit "nullable": true
+      }
+
       // Check if property is required
       if (requiredProps.includes(propName)) {
         if (!Object.prototype.hasOwnProperty.call(dto, propName)) {
           validationError = EntitySchema.getOrInitEntityValidationError(name, validationError);
-          validationError.addError(propName, 'required', `The ${propName} is required.`, validationError);
+          validationError.addError(propName, 'required', `The ${propName} is required.`);
           continue;
         }
       } else {
diff --git a/src/shared/models/entity/healthcheck/associations/applicationEntity.js b/src/shared/models/entity/healthcheck/associations/applicationEntity.js
index 1da92d536..f8605e0d7 100644
--- a/src/shared/models/entity/healthcheck/associations/applicationEntity.js
+++ b/src/shared/models/entity/healthcheck/associations/applicationEntity.js
@@ -41,21 +41,19 @@ class ApplicationEntity extends Entity {
           "type": "object",
           "required": ["remoteVersion", "currentVersion"],
           "properties": {
-            "remoteVersion": {"anyOf": [{
-              "type": "string"
-            }, {
-              "type": "null"
-            }]},
+            "remoteVersion": {
+              "type": "string",
+              "nullable": true,
+            },
             "currentVersion": {
               "type": "string"
             }
           }
         },
-        "latestVersion": {"anyOf": [{
+        "latestVersion": {
           "type": "boolean",
-        }, {
-          "type": "null"
-        }]},
+          "nullable": true,
+        },
         "schema": {
           "type": "boolean"
         },
@@ -81,11 +79,10 @@ class ApplicationEntity extends Entity {
             "isSelfRegistrationPluginEnabled": {
               "type": "boolean"
             },
-            "selfRegistrationProvider": {"anyOf": [{
-              "type": "string"
-            }, {
-              "type": "null"
-            }]},
+            "selfRegistrationProvider": {
+              "type": "string",
+              "nullable": true,
+            },
             "isRegistrationPublicRemovedFromPassbolt": {
               "type": "boolean"
             }
diff --git a/src/shared/models/entity/passwordExpiryPro/passwordExpiryProSettingsEntity.js b/src/shared/models/entity/passwordExpiryPro/passwordExpiryProSettingsEntity.js
index fcd236e09..c6a68542e 100644
--- a/src/shared/models/entity/passwordExpiryPro/passwordExpiryProSettingsEntity.js
+++ b/src/shared/models/entity/passwordExpiryPro/passwordExpiryProSettingsEntity.js
@@ -47,13 +47,10 @@ class PasswordExpiryProSettingsEntity extends Entity {
           "format": "uuid",
         },
         "default_expiry_period": {
-          "anyOf": [{
-            "type": "integer",
-            "gte": 1,
-            "lte": 999
-          }, {
-            "type": "null"
-          }]
+          "type": "integer",
+          "gte": 1,
+          "lte": 999,
+          "nullable": true,
         },
         "policy_override": {
           "type": "boolean",
diff --git a/src/shared/models/entity/ssoSettings/SsoSettingsEntity.js b/src/shared/models/entity/ssoSettings/SsoSettingsEntity.js
index 31b6e9fca..fc2dca7e3 100644
--- a/src/shared/models/entity/ssoSettings/SsoSettingsEntity.js
+++ b/src/shared/models/entity/ssoSettings/SsoSettingsEntity.js
@@ -61,12 +61,9 @@ class SsoSettingsEntity extends Entity {
           },
         },
         "provider": {
-          "anyOf": [{
-            "type": "string",
-            "enum": SsoSettingsEntity.AVAILABLE_PROVIDERS,
-          }, {
-            "type": "null"
-          }],
+          "type": "string",
+          "enum": SsoSettingsEntity.AVAILABLE_PROVIDERS,
+          "nullable": true,
         },
         "data": {
           "type": "object",
diff --git a/src/shared/models/entity/ssoSettings/SsoSettingsEntity.test.js b/src/shared/models/entity/ssoSettings/SsoSettingsEntity.test.js
index 6e37339d7..dc1ec03cb 100644
--- a/src/shared/models/entity/ssoSettings/SsoSettingsEntity.test.js
+++ b/src/shared/models/entity/ssoSettings/SsoSettingsEntity.test.js
@@ -71,7 +71,7 @@ describe("SsoSettingsEntity", () => {
       const successScenarios = successValues.map(value => ({scenario: `with value "${value}}"`, value: value}));
       const failingScenarios = failingValues.map(value => ({scenario: `with value "${value}}"`, value: value}));
 
-      assertEntityProperty.assert(SsoSettingsEntity, "provider", successScenarios, failingScenarios, "type");
+      assertEntityProperty.assert(SsoSettingsEntity, "provider", successScenarios, failingScenarios, "enum");
       assertEntityProperty.nullable(SsoSettingsEntity, "provider");
       assertEntityProperty.notRequired(SsoSettingsEntity, "provider");
     });
diff --git a/src/shared/models/passwordExpirySettings/PasswordExpirySettingsViewModel.test.js b/src/shared/models/passwordExpirySettings/PasswordExpirySettingsViewModel.test.js
index 003cb7010..01dcfde81 100644
--- a/src/shared/models/passwordExpirySettings/PasswordExpirySettingsViewModel.test.js
+++ b/src/shared/models/passwordExpirySettings/PasswordExpirySettingsViewModel.test.js
@@ -203,7 +203,7 @@ describe("PasswordExpirySettingsViewModel", () => {
       },
       {
         dto: {default_expiry_period: -1},
-        expectedErrors: {default_expiry_period: {type: "The default_expiry_period does not match any of the supported types."}},
+        expectedErrors: {default_expiry_period: {type: "The default_expiry_period is not a valid integer."}},
       },
     ]).describe("should validate the current data set with PasswordExpiryProSettingsEntity", scenario => {
       it(`for: ${JSON.stringify(scenario.dto)}`, () => {
diff --git a/test/assert/assertEntityProperty.js b/test/assert/assertEntityProperty.js
index 8ef2750ee..7010f7470 100644
--- a/test/assert/assertEntityProperty.js
+++ b/test/assert/assertEntityProperty.js
@@ -190,7 +190,7 @@ export const FAIL_LOCALE_SCENARIO = [
   {scenario: "Incomplete", value: "fr"},
 ];
 export const locale = (EntityClass, propertyName) => {
-  assert(EntityClass, propertyName, SUCCESS_LOCALE_SCENARIO, FAIL_LOCALE_SCENARIO, "type");
+  assert(EntityClass, propertyName, SUCCESS_LOCALE_SCENARIO, FAIL_LOCALE_SCENARIO, "pattern");
 };
 
 export const enumeration = (EntityClass, propertyName, successValues, failValues = []) => {