diff --git a/ramls/edge-patron.raml b/ramls/edge-patron.raml
index 2941523..26a6db6 100644
--- a/ramls/edge-patron.raml
+++ b/ramls/edge-patron.raml
@@ -22,6 +22,7 @@ types:
   allowedServicePoints: !include allowed-service-points-response.json
   hold-cancellation: !include hold-cancellation.json
   errors: !include raml-util/schemas/errors.schema
+  external_patron_error: !include raml-util/schemas/external_patron_error.schema
 
 /patron:
   displayName: Patron Services
@@ -70,8 +71,9 @@ types:
         422:
           description: Validation error
           body:
-            text/plain:
-              example: Validation error
+            application/json:
+              type: external_patron_error
+              example: !include examples/external_patron_error.json
         500:
           description: |
             Internal server error, e.g. due to misconfiguration
@@ -185,8 +187,9 @@ types:
           400:
             description: Bad request
             body:
-              text/plain:
-                example: unable to process request
+              application/json:
+                type: external_patron_error
+                example: !include examples/external_patron_error.json
           401:
             description: Not authorized to perform requested action
             body:
@@ -195,8 +198,9 @@ types:
           404:
             description: Item with a given ID not found
             body:
-              text/plain:
-                example: item not found
+              application/json:
+                type: external_patron_error
+                example: !include examples/external_patron_error.json
           403:
             description: Access Denied
             body:
diff --git a/ramls/examples/external_patron_error.json b/ramls/examples/external_patron_error.json
new file mode 100644
index 0000000..6bd017a
--- /dev/null
+++ b/ramls/examples/external_patron_error.json
@@ -0,0 +1,4 @@
+{
+  "code": 422,
+  "errorMessage": "USER_ALREADY_EXIST"
+}
diff --git a/ramls/raml-util b/ramls/raml-util
deleted file mode 160000
index 4aaeffa..0000000
--- a/ramls/raml-util
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 4aaeffa22d5461b41ac761870dcfce58bf8db387
diff --git a/ramls/raml-util/schemas/external_patron_error.schema b/ramls/raml-util/schemas/external_patron_error.schema
new file mode 100644
index 0000000..71feda7
--- /dev/null
+++ b/ramls/raml-util/schemas/external_patron_error.schema
@@ -0,0 +1,50 @@
+{
+  "$schema":"http://json-schema.org/draft-04/schema#",
+  "id":"external_patron_error.schema",
+  "description":"An external_patron user error",
+  "type":"object",
+  "properties":{
+    "code":{
+      "type":"integer",
+      "description":"Error code"
+    },
+    "errorMessage":{
+      "type":"string",
+      "description":"Error message text",
+      "examples":[
+        {
+          "value":"MULTIPLE_USER_WITH_EMAIL",
+          "description":"Multiple users found with the same email"
+        },
+        {
+          "value":"USER_ACCOUNT_INACTIVE",
+          "description":"User account is not active"
+        },
+        {
+          "value":"USER_ALREADY_EXIST",
+          "description":"User already exists"
+        },
+        {
+          "value":"USER_NOT_FOUND",
+          "description":"User does not exist"
+        },
+        {
+          "value":"EMAIL_ALREADY_EXIST",
+          "description":"User already exists with email provided in payload"
+        },
+        {
+          "value":"INVALID_PATRON_GROUP",
+          "description":"User does not belong to the required patron group"
+        },
+        {
+          "value":"PATRON_GROUP_NOT_APPLICABLE",
+          "description":"Required Patron group not applicable for user"
+        }
+      ]
+    }
+  },
+  "required":[
+    "code",
+    "errorMessage"
+  ]
+}