diff --git a/packages/apidom-ls/src/config/openapi/request-body/lint/allowed-fields-3-1.ts b/packages/apidom-ls/src/config/openapi/request-body/lint/allowed-fields-3-1.ts
new file mode 100644
index 0000000000..0436dfcb9f
--- /dev/null
+++ b/packages/apidom-ls/src/config/openapi/request-body/lint/allowed-fields-3-1.ts
@@ -0,0 +1,22 @@
+import ApilintCodes from '../../../codes';
+import { LinterMeta } from '../../../../apidom-language-types';
+
+// eslint-disable-next-line @typescript-eslint/naming-convention
+const allowedFields3_0Lint: LinterMeta = {
+  code: ApilintCodes.NOT_ALLOWED_FIELDS,
+  source: 'apilint',
+  message: 'Object includes not allowed fields',
+  severity: 1,
+  linterFunction: 'allowedFields',
+  linterParams: [['description', 'content', 'required'], 'x-'],
+  marker: 'key',
+  conditions: [
+    {
+      function: 'missingField',
+      params: ['$ref'],
+    },
+  ],
+  targetSpecs: [{ namespace: 'openapi', version: '3.1.0' }],
+};
+
+export default allowedFields3_0Lint;
diff --git a/packages/apidom-ls/src/config/openapi/request-body/lint/index.ts b/packages/apidom-ls/src/config/openapi/request-body/lint/index.ts
index 38c812980f..fd5c7f48ed 100644
--- a/packages/apidom-ls/src/config/openapi/request-body/lint/index.ts
+++ b/packages/apidom-ls/src/config/openapi/request-body/lint/index.ts
@@ -1,4 +1,5 @@
 import allowedFields3_0Lint from './allowed-fields-3-0';
+import allowedFields3_1Lint from './allowed-fields-3-1';
 import descriptionTypeLint from './description--type';
 import contentValuesTypeLint from './content--values-type';
 import contentRequiredLint from './content--required';
@@ -10,6 +11,7 @@ const lints = [
   contentValuesTypeLint,
   requiredTypeLint,
   allowedFields3_0Lint,
+  allowedFields3_1Lint,
 ];
 
 export default lints;