diff --git a/changes/1548.fix.rst b/changes/1548.fix.rst
new file mode 100644
index 00000000..80195c05
--- /dev/null
+++ b/changes/1548.fix.rst
@@ -0,0 +1,4 @@
+Mock+Test: Added missing defaults for properties 'shared', 'description' and
+'fulfillment-state' to the mocked 'Create Storage Group' operation.
+Added missing properties and fixed property name typos in the end2end
+mock test files mocked_hmc_z14.yaml and mocked_hmc_z16.yaml.
diff --git a/tests/end2end/mocked_hmc_z14.yaml b/tests/end2end/mocked_hmc_z14.yaml
index 54d49de1..90852db2 100644
--- a/tests/end2end/mocked_hmc_z14.yaml
+++ b/tests/end2end/mocked_hmc_z14.yaml
@@ -277,17 +277,18 @@ hmc_definition:
         - properties:
             object-id: sg1
             name: Storage group 1
-            description: Storage group 1
+            description: Storage group 1 attached to CPC_DPM
             shared: false
             type: fcp
             fulfillment-state: complete
+            cpc-uri: /api/cpcs/cpc_dpm
           storage_volumes:
             - properties:
                 element-id: sv1
                 name: Storage volume 1
                 description: Storage volume 1
                 fulfillment-state: complete
-                site: 10.0
+                size: 10.0
                 usage: boot
   cpcs:
     - properties:
@@ -494,6 +495,7 @@ hmc_definition:
             next-activation-profile-name: "LPAR1"
             last-used-activation-profile: "LPAR1"
             has-unacceptable-status: false
+            has-operating-system-messages: true
         - properties:
             object-id: lpar2
             name: "LPAR2"
@@ -505,6 +507,7 @@ hmc_definition:
             next-activation-profile-name: "LPAR2"
             last-used-activation-profile: "LPAR2"
             has-unacceptable-status: true
+            has-operating-system-messages: false
       reset_activation_profiles:
         - properties:
             name: "CPC_CLA"
diff --git a/tests/end2end/mocked_hmc_z16.yaml b/tests/end2end/mocked_hmc_z16.yaml
index 76205d4f..645720e0 100644
--- a/tests/end2end/mocked_hmc_z16.yaml
+++ b/tests/end2end/mocked_hmc_z16.yaml
@@ -277,17 +277,18 @@ hmc_definition:
         - properties:
             object-id: sg1
             name: Storage group 1
-            description: Storage group 1
+            description: Storage group 1 attached to CPC_DPM
             shared: false
             type: fcp
             fulfillment-state: complete
+            cpc-uri: /api/cpcs/cpc_dpm
           storage_volumes:
             - properties:
                 element-id: sv1
                 name: Storage volume 1
                 description: Storage volume 1
                 fulfillment-state: complete
-                site: 10.0
+                size: 10.0
                 usage: boot
   cpcs:
     - properties:
@@ -494,6 +495,7 @@ hmc_definition:
             next-activation-profile-name: "LPAR1"
             last-used-activation-profile: "LPAR1"
             has-unacceptable-status: false
+            has-operating-system-messages: true
         - properties:
             object-id: lpar2
             name: "LPAR2"
@@ -505,6 +507,7 @@ hmc_definition:
             next-activation-profile-name: "LPAR2"
             last-used-activation-profile: "LPAR2"
             has-unacceptable-status: true
+            has-operating-system-messages: false
       reset_activation_profiles:
         - properties:
             name: "CPC_CLA"
diff --git a/zhmcclient_mock/_urihandler.py b/zhmcclient_mock/_urihandler.py
index 1479a469..f949b47b 100644
--- a/zhmcclient_mock/_urihandler.py
+++ b/zhmcclient_mock/_urihandler.py
@@ -3973,6 +3973,9 @@ def post(method, hmc, uri, uri_parms, body, logon_required,
 
         body2 = body.copy()
         sv_requests = body2.pop('storage-volumes', None)
+        body2.setdefault('shared', True)
+        body2.setdefault('description', '')
+        body2['fulfillment-state'] = 'pending'
         new_storage_group = hmc.consoles.console.storage_groups.add(body2)
 
         sv_uris = []