diff --git a/src/schemas/definitions.json b/src/schemas/definitions.json
index 78bf010..9df5a51 100644
--- a/src/schemas/definitions.json
+++ b/src/schemas/definitions.json
@@ -33,6 +33,13 @@
       "type": "integer",
       "maximum": 10000,
       "minimum": 0
+    },
+    "orderUID": {
+      "$id": "#/definitions/orderUID",
+      "pattern": "^0x[a-fA-F0-9]{112}$",
+      "title": "Order UID",
+      "examples": ["0xff2e2e54d178997f173266817c1e9ed6fee1a1aae4b43971c53b543cffcc2969845c6f5599fbb25dbdd1b9b013daf85c03f3c63763e4bc4a"],
+      "type": "string"
     }
   }
 }
diff --git a/src/schemas/replacedOrder/v0.1.0.json b/src/schemas/replacedOrder/v0.1.0.json
new file mode 100644
index 0000000..c273abe
--- /dev/null
+++ b/src/schemas/replacedOrder/v0.1.0.json
@@ -0,0 +1,7 @@
+{
+  "$id": "#replacedOrder/v0.1.0.json",
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "$ref": "../definitions.json#/definitions/orderUID",
+  "title": "replacedOrder",
+  "description": "The order UID of the order to be replaced."
+}
diff --git a/src/schemas/v1.0.1.json b/src/schemas/v1.0.1.json
new file mode 100644
index 0000000..3472989
--- /dev/null
+++ b/src/schemas/v1.0.1.json
@@ -0,0 +1,68 @@
+{
+  "$id": "https://cowswap.exchange/schemas/app-data/v0.11.0.json",
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "description": "Metadata JSON document for adding information to orders.",
+  "required": ["version", "metadata"],
+  "title": "AppData Root Schema",
+  "type": "object",
+  "additionalProperties": false,
+  "properties": {
+    "version": {
+      "$ref": "definitions.json#/definitions/version",
+      "readOnly": true,
+      "default": "0.11.0"
+    },
+    "appCode": {
+      "$id": "#/properties/appCode",
+      "description": "The code identifying the CLI, UI, service generating the order.",
+      "examples": ["CoW Swap"],
+      "title": "App Code",
+      "type": "string"
+    },
+    "environment": {
+      "$id": "#/properties/environment",
+      "description": "Environment from which the order came from.",
+      "title": "Environment",
+      "type": "string",
+      "examples": ["production", "development", "staging", "ens"]
+    },
+    "metadata": {
+      "$id": "#/properties/metadata",
+      "default": {},
+      "description": "Each metadata will specify one aspect of the order.",
+      "required": [],
+      "title": "Metadata",
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "signer": {
+          "$ref": "signer/v0.1.0.json#"
+        },
+        "referrer": {
+          "$ref": "referrer/v0.2.0.json#"
+        },
+        "utm": {
+          "$ref": "utm/v0.2.0.json#"
+        },
+        "quote": {
+          "$ref": "quote/v1.0.0.json#"
+        },
+        "orderClass": {
+          "$ref": "orderClass/v0.3.0.json#"
+        },
+        "hooks": {
+          "$ref": "hooks/v0.1.0.json#"
+        },
+        "widget": {
+          "$ref": "widget/v0.1.0.json#"
+        },
+        "partnerFee": {
+          "$ref": "partnerFee/v0.1.0.json#"
+        },
+        "replacedOrder": {
+          "$ref": "replacedOrder/v0.1.0.json#"
+        }
+      }
+    }
+  }
+}
diff --git a/test/schema.spec.ts b/test/schema.spec.ts
index bf9487c..7f1fb37 100644
--- a/test/schema.spec.ts
+++ b/test/schema.spec.ts
@@ -10,6 +10,7 @@ import schemaV0_9_0 from '../schemas/v0.9.0.json'
 import schemaV0_10_0 from '../schemas/v0.10.0.json'
 import schemaV0_11_0 from '../schemas/v0.11.0.json'
 import schemaV1_0_0 from '../schemas/v1.0.0.json'
+import schemaV1_0_1 from '../schemas/v1.0.1.json'
 
 const ADDRESS = '0xb6BAd41ae76A11D10f7b0E664C5007b908bC77C9'
 const REFERRER_V0_1_0 = { address: ADDRESS, version: '0.1.0' }
@@ -886,6 +887,45 @@ describe('Schema v1.0.0: Update quote definition', () => {
   )
 })
 
+describe('Schema v1.0.1: Add replaced order', () => {
+    const ajv = new Ajv()
+    const validator = ajv.compile(schemaV1_0_1)
+
+    const BASE_DOCUMENT = {
+        version: '1.0.1',
+        metadata: {},
+    }
+
+    test(
+        'Valid order id',
+        _buildAssertValidFn(validator, {
+            ...BASE_DOCUMENT,
+            metadata: { replacedOrder: "0xff2e2e54d178997f173266817c1e9ed6fee1a1aae4b43971c53b543cffcc2969845c6f5599fbb25dbdd1b9b013daf85c03f3c63763e4bc4a" },
+        })
+    )
+
+
+    test(
+        'Invalid order id length',
+        _buildAssertInvalidFn(
+            validator,
+            {
+                ...BASE_DOCUMENT,
+                metadata: { replacedOrder: "0xff2e2e54d178997f173266817c1e9ed6fee1a1aae4b43971c53b543cffcc2969845c6f5599fbb25dbdd1b9b013daf85c03f3c63763e44a" },
+            },
+            [
+                {
+                    instancePath: '/metadata/replacedOrder',
+                    keyword: "pattern",
+                    message: "must match pattern \"^0x[a-fA-F0-9]{112}$\"",
+                    params: { pattern: "^0x[a-fA-F0-9]{112}$" },
+                    schemaPath: '#/properties/metadata/properties/replacedOrder/pattern',
+                },
+            ]
+        )
+    )
+})
+
 function _buildAssertValidFn(validator: ValidateFunction, doc: any) {
   return () => {
     // when