diff --git a/packages/api-contract/test/compare/user_v0_recursive.test.json b/packages/api-contract/test/compare/user_v0_recursive.test.json
index 5f17be7653..05563deac5 100644
--- a/packages/api-contract/test/compare/user_v0_recursive.test.json
+++ b/packages/api-contract/test/compare/user_v0_recursive.test.json
@@ -18,6 +18,7 @@
         "lookupIndex": 1,
         "lookupName": "RecursiveMyEnum",
         "type": "Lookup1",
+        "typeName": "MyEnum",
         "index": 1,
         "name": "B"
       }
diff --git a/packages/types/src/create/types.ts b/packages/types/src/create/types.ts
index 798cf12a71..2cd34aaa55 100644
--- a/packages/types/src/create/types.ts
+++ b/packages/types/src/create/types.ts
@@ -41,6 +41,7 @@ export interface TypeDef {
   namespace?: string;
   sub?: TypeDef | TypeDef[];
   type: string;
+  typeName?: string;
 }
 
 export interface CreateOptions {
diff --git a/packages/types/src/generic/PortableRegistry/PortableRegistry.ts b/packages/types/src/generic/PortableRegistry/PortableRegistry.ts
index 4c3d6ce1b4..057c178a18 100644
--- a/packages/types/src/generic/PortableRegistry/PortableRegistry.ts
+++ b/packages/types/src/generic/PortableRegistry/PortableRegistry.ts
@@ -12,6 +12,7 @@ import { assert, isNumber, isString, stringCamelCase, stringify, stringUpperFirs
 import { Struct } from '../../codec/Struct';
 import { withTypeString } from '../../create/encodeTypes';
 import { getTypeDef } from '../../create/getTypeDef';
+import { sanitize } from '../../create/sanitize';
 import { TypeDefInfo } from '../../types';
 
 // Just a placeholder for a type.unrwapOr()
@@ -439,11 +440,15 @@ export class GenericPortableRegistry extends Struct {
     } else if (['Range', 'RangeInclusive'].includes(specialVariant)) {
       return withTypeString(this.registry, {
         info: TypeDefInfo.Range,
-        sub: fields.map(({ name, type }, index) => ({
+        sub: fields.map(({ name, type, typeName }, index) => ({
           name: name.isSome
             ? name.unwrap().toString()
             : ['start', 'end'][index],
-          ...this.#createSiDef(type)
+          ...this.#createSiDef(type),
+          ...(typeName.isSome
+            ? { typeName: sanitize(typeName.unwrap()) }
+            : {}
+          )
         }))
       });
     } else if (path.length && path[path.length - 1].toString() === 'WrapperOpaque') {
@@ -493,14 +498,17 @@ export class GenericPortableRegistry extends Struct {
 
       return {
         ...typeDef,
-        ...(
-          lookupIndex === -1
-            ? {}
-            : {
-              lookupIndex,
-              lookupName: this.#names[lookupIndex],
-              lookupNameRoot: typeDef.lookupName
-            }
+        ...(lookupIndex === -1
+          ? {}
+          : {
+            lookupIndex,
+            lookupName: this.#names[lookupIndex],
+            lookupNameRoot: typeDef.lookupName
+          }
+        ),
+        ...(fields[0].typeName.isSome
+          ? { typeName: sanitize(fields[0].typeName.unwrap()) }
+          : {}
         )
       };
     }
@@ -530,7 +538,7 @@ export class GenericPortableRegistry extends Struct {
 
   #extractFieldsAlias (fields: SiField[]): [TypeDef[], Map<string, string>] {
     const alias = new Map<string, string>();
-    const sub = fields.map(({ docs, name, type }) => {
+    const sub = fields.map(({ docs, name, type, typeName }) => {
       const typeDef = this.#createSiDef(type);
 
       if (name.isNone) {
@@ -555,7 +563,11 @@ export class GenericPortableRegistry extends Struct {
       return {
         ...typeDef,
         docs: docs.map((d) => d.toString()),
-        name: nameField
+        name: nameField,
+        ...(typeName.isSome
+          ? { typeName: sanitize(typeName.unwrap()) }
+          : {}
+        )
       };
     });
 
diff --git a/packages/types/src/interfaces/metadata/types.ts b/packages/types/src/interfaces/metadata/types.ts
index aa2df669ac..34868a1940 100644
--- a/packages/types/src/interfaces/metadata/types.ts
+++ b/packages/types/src/interfaces/metadata/types.ts
@@ -103,7 +103,11 @@ export interface FunctionArgumentMetadataV12 extends FunctionArgumentMetadataV11
 export interface FunctionArgumentMetadataV13 extends FunctionArgumentMetadataV12 {}
 
 /** @name FunctionArgumentMetadataV14 */
-export interface FunctionArgumentMetadataV14 extends FunctionArgumentMetadataV13 {}
+export interface FunctionArgumentMetadataV14 extends Struct {
+  readonly name: Text;
+  readonly type: Type;
+  readonly typeName: Option<Type>;
+}
 
 /** @name FunctionArgumentMetadataV9 */
 export interface FunctionArgumentMetadataV9 extends Struct {
diff --git a/packages/types/src/interfaces/metadata/v14.ts b/packages/types/src/interfaces/metadata/v14.ts
index 4f557daada..c7f255d951 100644
--- a/packages/types/src/interfaces/metadata/v14.ts
+++ b/packages/types/src/interfaces/metadata/v14.ts
@@ -25,7 +25,11 @@ export const v14: DefinitionsTypes = {
     ...Si1Variant,
     args: 'Vec<Type>'
   },
-  FunctionArgumentMetadataV14: 'FunctionArgumentMetadataV13',
+  FunctionArgumentMetadataV14: {
+    name: 'Text',
+    type: 'Type',
+    typeName: 'Option<Type>'
+  },
   FunctionMetadataV14: {
     ...Si1Variant,
     args: 'Vec<FunctionArgumentMetadataV14>'
diff --git a/packages/types/src/metadata/decorate/extrinsics/index.ts b/packages/types/src/metadata/decorate/extrinsics/index.ts
index 095d5cd27a..2201239b49 100644
--- a/packages/types/src/metadata/decorate/extrinsics/index.ts
+++ b/packages/types/src/metadata/decorate/extrinsics/index.ts
@@ -24,9 +24,13 @@ export function decorateExtrinsics (registry: Registry, { lookup, pallets }: Met
         .reduce((newModule: ModuleExtrinsics, variant): ModuleExtrinsics => {
           const callMetadata = registry.createType('FunctionMetadataLatest', {
             ...variant,
-            args: variant.fields.map(({ name, type }, index) => ({
+            args: variant.fields.map(({ name, type, typeName }, index) => ({
               name: stringCamelCase(name.unwrapOr(`param${index}`)),
-              type: getSiName(lookup, type)
+              type: getSiName(lookup, type),
+              ...(typeName.isSome
+                ? { typeName: typeName.unwrap() }
+                : {}
+              )
             }))
           });