diff --git a/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/main/rest/InstantiationController.java b/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/main/rest/InstantiationController.java
index afe0931..1a34b37 100644
--- a/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/main/rest/InstantiationController.java
+++ b/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/main/rest/InstantiationController.java
@@ -110,7 +110,7 @@
     public ResponseEntity<InstantiationResponse> deleteCompositionInstance(UUID compositionId, UUID instanceId,
             UUID requestId) {
 
-        return ResponseEntity.ok().body(provider.deleteAutomationComposition(compositionId, instanceId));
+        return ResponseEntity.accepted().body(provider.deleteAutomationComposition(compositionId, instanceId));
     }
 
     @Override
diff --git a/runtime-acm/src/main/resources/openapi/openapi.yaml b/runtime-acm/src/main/resources/openapi/openapi.yaml
index c9b6e1f..33f8c9b 100644
--- a/runtime-acm/src/main/resources/openapi/openapi.yaml
+++ b/runtime-acm/src/main/resources/openapi/openapi.yaml
@@ -125,6 +125,27 @@
             application/json:
               schema:
                 $ref: '#/components/schemas/SimpleResponse'
+        500:
+          description: Internal Server Error, returns an instance of
+            [SimpleResponse](https://github.com/onap/policy-clamp/blob/master/models/src/main/java/org/onap/policy/clamp/models/acm/messages/rest/SimpleResponse.java)
+          headers:
+            X-LatestVersion:
+              schema:
+                type: string
+            X-PatchVersion:
+              schema:
+                type: string
+            X-MinorVersion:
+              schema:
+                type: string
+            X-onap-RequestId:
+              schema:
+                type: string
+                format: uuid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleResponse'
       security:
       - basicAuth: []
       x-interface info:
@@ -204,6 +225,27 @@
             application/json:
               schema:
                 $ref: '#/components/schemas/SimpleResponse'
+        500:
+          description: Internal Server Error, returns an instance of
+            [SimpleResponse](https://github.com/onap/policy-clamp/blob/master/models/src/main/java/org/onap/policy/clamp/models/acm/messages/rest/SimpleResponse.java)
+          headers:
+            X-LatestVersion:
+              schema:
+                type: string
+            X-PatchVersion:
+              schema:
+                type: string
+            X-MinorVersion:
+              schema:
+                type: string
+            X-onap-RequestId:
+              schema:
+                type: string
+                format: uuid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleResponse'
       security:
       - basicAuth: []
       x-interface info:
@@ -306,6 +348,27 @@
             application/json:
               schema:
                 $ref: '#/components/schemas/SimpleResponse'
+        500:
+          description: Internal Server Error, returns an instance of
+            [SimpleResponse](https://github.com/onap/policy-clamp/blob/master/models/src/main/java/org/onap/policy/clamp/models/acm/messages/rest/SimpleResponse.java)
+          headers:
+            X-LatestVersion:
+              schema:
+                type: string
+            X-PatchVersion:
+              schema:
+                type: string
+            X-MinorVersion:
+              schema:
+                type: string
+            X-onap-RequestId:
+              schema:
+                type: string
+                format: uuid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleResponse'
       security:
       - basicAuth: []
       x-interface info:
@@ -413,6 +476,27 @@
             application/json:
               schema:
                 $ref: '#/components/schemas/SimpleResponse'
+        500:
+          description: Internal Server Error, returns an instance of
+            [SimpleResponse](https://github.com/onap/policy-clamp/blob/master/models/src/main/java/org/onap/policy/clamp/models/acm/messages/rest/SimpleResponse.java)
+          headers:
+            X-LatestVersion:
+              schema:
+                type: string
+            X-PatchVersion:
+              schema:
+                type: string
+            X-MinorVersion:
+              schema:
+                type: string
+            X-onap-RequestId:
+              schema:
+                type: string
+                format: uuid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleResponse'
       security:
       - basicAuth: []
       x-interface info:
@@ -500,6 +584,27 @@
             application/json:
               schema:
                 $ref: '#/components/schemas/SimpleResponse'
+        500:
+          description: Internal Server Error, returns an instance of
+            [SimpleResponse](https://github.com/onap/policy-clamp/blob/master/models/src/main/java/org/onap/policy/clamp/models/acm/messages/rest/SimpleResponse.java)
+          headers:
+            X-LatestVersion:
+              schema:
+                type: string
+            X-PatchVersion:
+              schema:
+                type: string
+            X-MinorVersion:
+              schema:
+                type: string
+            X-onap-RequestId:
+              schema:
+                type: string
+                format: uuid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleResponse'
       security:
       - basicAuth: []
       x-interface info:
@@ -607,6 +712,27 @@
             application/json:
               schema:
                 $ref: '#/components/schemas/SimpleResponse'
+        500:
+          description: Internal Server Error, returns an instance of
+            [SimpleResponse](https://github.com/onap/policy-clamp/blob/master/models/src/main/java/org/onap/policy/clamp/models/acm/messages/rest/SimpleResponse.java)
+          headers:
+            X-LatestVersion:
+              schema:
+                type: string
+            X-PatchVersion:
+              schema:
+                type: string
+            X-MinorVersion:
+              schema:
+                type: string
+            X-onap-RequestId:
+              schema:
+                type: string
+                format: uuid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleResponse'
       security:
       - basicAuth: []
       x-interface info:
@@ -709,6 +835,27 @@
             application/json:
               schema:
                 $ref: '#/components/schemas/SimpleResponse'
+        500:
+          description: Internal Server Error, returns an instance of
+            [SimpleResponse](https://github.com/onap/policy-clamp/blob/master/models/src/main/java/org/onap/policy/clamp/models/acm/messages/rest/SimpleResponse.java)
+          headers:
+            X-LatestVersion:
+              schema:
+                type: string
+            X-PatchVersion:
+              schema:
+                type: string
+            X-MinorVersion:
+              schema:
+                type: string
+            X-onap-RequestId:
+              schema:
+                type: string
+                format: uuid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleResponse'
       security:
       - basicAuth: []
       x-interface info:
@@ -830,6 +977,27 @@
             application/json:
               schema:
                 $ref: '#/components/schemas/SimpleResponse'
+        500:
+          description: Internal Server Error, returns an instance of
+            [SimpleResponse](https://github.com/onap/policy-clamp/blob/master/models/src/main/java/org/onap/policy/clamp/models/acm/messages/rest/SimpleResponse.java)
+          headers:
+            X-LatestVersion:
+              schema:
+                type: string
+            X-PatchVersion:
+              schema:
+                type: string
+            X-MinorVersion:
+              schema:
+                type: string
+            X-onap-RequestId:
+              schema:
+                type: string
+                format: uuid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleResponse'
       security:
       - basicAuth: []
       x-interface info:
@@ -949,6 +1117,27 @@
             application/json:
               schema:
                 $ref: '#/components/schemas/SimpleResponse'
+        500:
+          description: Internal Server Error, returns an instance of
+            [SimpleResponse](https://github.com/onap/policy-clamp/blob/master/models/src/main/java/org/onap/policy/clamp/models/acm/messages/rest/SimpleResponse.java)
+          headers:
+            X-LatestVersion:
+              schema:
+                type: string
+            X-PatchVersion:
+              schema:
+                type: string
+            X-MinorVersion:
+              schema:
+                type: string
+            X-onap-RequestId:
+              schema:
+                type: string
+                format: uuid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleResponse'
       security:
       - basicAuth: []
       x-interface info:
@@ -1060,6 +1249,27 @@
             application/json:
               schema:
                 $ref: '#/components/schemas/SimpleResponse'
+        500:
+          description: Internal Server Error, returns an instance of
+            [SimpleResponse](https://github.com/onap/policy-clamp/blob/master/models/src/main/java/org/onap/policy/clamp/models/acm/messages/rest/SimpleResponse.java)
+          headers:
+            X-LatestVersion:
+              schema:
+                type: string
+            X-PatchVersion:
+              schema:
+                type: string
+            X-MinorVersion:
+              schema:
+                type: string
+            X-onap-RequestId:
+              schema:
+                type: string
+                format: uuid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleResponse'
       security:
       - basicAuth: []
       x-interface info:
@@ -1195,6 +1405,27 @@
             application/json:
               schema:
                 $ref: '#/components/schemas/SimpleResponse'
+        500:
+          description: Internal Server Error, returns an instance of
+            [SimpleResponse](https://github.com/onap/policy-clamp/blob/master/models/src/main/java/org/onap/policy/clamp/models/acm/messages/rest/SimpleResponse.java)
+          headers:
+            X-LatestVersion:
+              schema:
+                type: string
+            X-PatchVersion:
+              schema:
+                type: string
+            X-MinorVersion:
+              schema:
+                type: string
+            X-onap-RequestId:
+              schema:
+                type: string
+                format: uuid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleResponse'
       security:
       - basicAuth: []
       x-interface info:
@@ -1301,6 +1532,27 @@
             application/json:
               schema:
                 $ref: '#/components/schemas/SimpleResponse'
+        500:
+          description: Internal Server Error, returns an instance of
+            [SimpleResponse](https://github.com/onap/policy-clamp/blob/master/models/src/main/java/org/onap/policy/clamp/models/acm/messages/rest/SimpleResponse.java)
+          headers:
+            X-LatestVersion:
+              schema:
+                type: string
+            X-PatchVersion:
+              schema:
+                type: string
+            X-MinorVersion:
+              schema:
+                type: string
+            X-onap-RequestId:
+              schema:
+                type: string
+                format: uuid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleResponse'
       security:
       - basicAuth: []
       x-interface info:
@@ -1431,6 +1683,27 @@
             application/json:
               schema:
                 $ref: '#/components/schemas/SimpleResponse'
+        500:
+          description: Internal Server Error, returns an instance of
+            [SimpleResponse](https://github.com/onap/policy-clamp/blob/master/models/src/main/java/org/onap/policy/clamp/models/acm/messages/rest/SimpleResponse.java)
+          headers:
+            X-LatestVersion:
+              schema:
+                type: string
+            X-PatchVersion:
+              schema:
+                type: string
+            X-MinorVersion:
+              schema:
+                type: string
+            X-onap-RequestId:
+              schema:
+                type: string
+                format: uuid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleResponse'
       security:
       - basicAuth: []
       x-interface info:
@@ -1441,7 +1714,7 @@
       tags:
       - Automation Composition Instance
       summary: Delete an automation composition instance
-      description: Deletes a automation composition instance, returning the UUID of the deleted automation composition instance
+      description: Order a deletion of an automation composition instance, returning the UUID of the automation composition instance to be deleted
       operationId: deleteCompositionInstance
       parameters:
       - name : compositionId
@@ -1465,7 +1738,7 @@
           type: string
           format: uuid
       responses:
-        200:
+        202:
           description: Serialised instance of
             [InstantiationResponse](https://github.com/onap/policy-clamp/blob/master/models/src/main/java/org/onap/policy/clamp/models/acm/messages/rest/instantiation/InstantiationResponse.java)
             containing the UUID of the deleted automation composition instance
@@ -1557,6 +1830,27 @@
             application/json:
               schema:
                 $ref: '#/components/schemas/SimpleResponse'
+        500:
+          description: Internal Server Error, returns an instance of
+            [SimpleResponse](https://github.com/onap/policy-clamp/blob/master/models/src/main/java/org/onap/policy/clamp/models/acm/messages/rest/SimpleResponse.java)
+          headers:
+            X-LatestVersion:
+              schema:
+                type: string
+            X-PatchVersion:
+              schema:
+                type: string
+            X-MinorVersion:
+              schema:
+                type: string
+            X-onap-RequestId:
+              schema:
+                type: string
+                format: uuid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleResponse'
       security:
       - basicAuth: []
       x-interface info:
diff --git a/runtime-acm/src/test/java/org/onap/policy/clamp/acm/runtime/instantiation/rest/InstantiationControllerTest.java b/runtime-acm/src/test/java/org/onap/policy/clamp/acm/runtime/instantiation/rest/InstantiationControllerTest.java
index 5380d67..8948f5f 100644
--- a/runtime-acm/src/test/java/org/onap/policy/clamp/acm/runtime/instantiation/rest/InstantiationControllerTest.java
+++ b/runtime-acm/src/test/java/org/onap/policy/clamp/acm/runtime/instantiation/rest/InstantiationControllerTest.java
@@ -263,7 +263,7 @@
 
         var invocationBuilder = super.sendRequest(getInstanceEndPoint(compositionId, instResponse.getInstanceId()));
         var resp = invocationBuilder.delete();
-        assertEquals(Response.Status.OK.getStatusCode(), resp.getStatus());
+        assertEquals(Response.Status.ACCEPTED.getStatusCode(), resp.getStatus());
         instResponse = resp.readEntity(InstantiationResponse.class);
         InstantiationUtils.assertInstantiationResponse(instResponse, automationCompositionFromRsc);