diff --git a/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/AddMembersInstanceId.json b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/AddMembersInstanceId.json
new file mode 100644
index 0000000..1080513
--- /dev/null
+++ b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/AddMembersInstanceId.json
@@ -0,0 +1,17 @@
+{
+  "requestDetails": {
+    "requestInfo": {
+      "source": "VID",
+      "requestorId": "xxxxxx"
+    },
+    "relatedInstanceList": [
+      {
+        "relatedInstance": {
+          "modelInfo": {
+            "modelType": "vnf"
+          }
+        }
+      }
+    ]
+  }
+}
diff --git a/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/AddMembersSource.json b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/AddMembersSource.json
new file mode 100644
index 0000000..ca4798e
--- /dev/null
+++ b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/AddMembersSource.json
@@ -0,0 +1,17 @@
+{
+  "requestDetails": {
+    "requestInfo": {
+      "requestorId": "xxxxxx"
+    },
+    "relatedInstanceList": [
+      {
+        "relatedInstance": {
+          "instanceId": "{the to be related vnf-id}",
+          "modelInfo": {
+            "modelType": "vnf"
+          }
+        }
+      }
+    ]
+  }
+}
diff --git a/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/DeleteMembersModelType.json b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/DeleteMembersModelType.json
new file mode 100644
index 0000000..d3afee1
--- /dev/null
+++ b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/DeleteMembersModelType.json
@@ -0,0 +1,17 @@
+{
+  "requestDetails": {
+    "requestInfo": {
+      "source": "VID",
+      "requestorId": "xxxxxx"
+    },
+    "relatedInstanceList": [
+      {
+        "relatedInstance": {
+          "instanceId": "{the to be related vnf-id}",
+          "modelInfo": {
+          }
+        }
+      }
+    ]
+  }
+}
diff --git a/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/MembersRequestInfo.json b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/MembersRequestInfo.json
new file mode 100644
index 0000000..c4240a8
--- /dev/null
+++ b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/MembersRequestInfo.json
@@ -0,0 +1,14 @@
+{
+  "requestDetails": {
+    "relatedInstanceList": [
+      {
+        "relatedInstance": {
+          "instanceId": "{the to be related vnf-id}",
+          "modelInfo": {
+            "modelType": "vnf"
+          }
+        }
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/MembersRequestorId.json b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/MembersRequestorId.json
new file mode 100644
index 0000000..8564b60
--- /dev/null
+++ b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/MembersRequestorId.json
@@ -0,0 +1,17 @@
+{
+	"requestDetails": {
+	    "requestInfo": {
+	      "source": "VID"
+	    },
+	    "relatedInstanceList": [
+	      {
+	        "relatedInstance": {
+	          "instanceId": "{the to be removed as member vnf-id}",
+	          "modelInfo": {
+	            "modelType": "vnf"
+	          }
+	        }
+	      }
+	    ]
+	  }
+}
diff --git a/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/RelatedInstances.json b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/RelatedInstances.json
new file mode 100644
index 0000000..616f79b
--- /dev/null
+++ b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/RelatedInstances.json
@@ -0,0 +1,15 @@
+{
+  "requestDetails": {
+    "modelInfo": {
+      "modelType": "instanceGroup",
+      "modelVersionId": "ddcbbf3d-f2c1-4ca0-8852-76a807285efc"
+    },
+    "requestInfo": {
+      "source": "VID",
+      "requestorId": "xxxxxx"
+    },
+    "requestParameters": {
+      "userParams": []
+    }
+  }
+}
\ No newline at end of file
diff --git a/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/RelatedInstancesVnf.json b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/RelatedInstancesVnf.json
new file mode 100644
index 0000000..0d33964
--- /dev/null
+++ b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/MembersValidation/RelatedInstancesVnf.json
@@ -0,0 +1,25 @@
+{
+  "requestDetails": {
+    "modelInfo": {
+      "modelType": "instanceGroup",
+      "modelVersionId": "ddcbbf3d-f2c1-4ca0-8852-76a807285efc"
+    },
+    "requestInfo": {
+      "source": "VID",
+      "requestorId": "xxxxxx"
+    },
+    "relatedInstanceList": [
+      {
+        "relatedInstance": {
+          "instanceId": "96f40d14-705d-40d9-b829-3dab90811321",
+          "modelInfo": {
+            "modelType": "vfModule"
+          }
+        }
+      }
+    ],
+    "requestParameters": {
+      "userParams": []
+    }
+  }
+}
\ No newline at end of file
diff --git a/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/ModelInfo/CreateInstanceGroupNoModelVersionId.json b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/ModelInfo/CreateInstanceGroupNoModelVersionId.json
new file mode 100644
index 0000000..0bac9ce
--- /dev/null
+++ b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/ModelInfo/CreateInstanceGroupNoModelVersionId.json
@@ -0,0 +1,25 @@
+{
+  "requestDetails": {
+    "modelInfo": {
+      "modelType": "instanceGroup"
+    },
+    "requestInfo": {
+      "source": "VID",
+      "requestorId": "xxxxxx"
+    },
+    "relatedInstanceList": [
+      {
+        "relatedInstance": {
+          "instanceId": "96f40d14-705d-40d9-b829-3dab90811321",
+          "modelInfo": {
+            "modelType": "service"
+          }
+        }
+      }
+    ],
+    "requestParameters": {
+      "userParams": []
+    }
+  }
+}
+
diff --git a/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/RelatedInstances/CreateInstanceGroupNoModelCustomizationId.json b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/RelatedInstances/CreateInstanceGroupNoModelCustomizationId.json
new file mode 100644
index 0000000..058daf2
--- /dev/null
+++ b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/RelatedInstances/CreateInstanceGroupNoModelCustomizationId.json
@@ -0,0 +1,33 @@
+{
+  "requestDetails": {
+    "modelInfo": {
+      "modelType": "instanceGroup",
+      "modelVersionId": "ddcbbf3d-f2c1-4ca0-8852-76a807285efc"
+    },
+    "requestInfo": {
+      "source": "VID",
+      "requestorId": "xxxxxx"
+    },
+    "relatedInstanceList": [
+      {
+        "relatedInstance": {
+          "instanceId": "96f40d14-705d-40d9-b829-3dab90811321",
+          "modelInfo": {
+            "modelType": "service"
+          }
+        }
+      },
+      {
+        "relatedInstance": {
+          "modelInfo": {
+            "modelType": "service"
+          }
+        }
+      }
+    ],
+    "requestParameters": {
+      "userParams": []
+    }
+  }
+}
+
diff --git a/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/RelatedInstances/CreateInstanceGroupNoRelatedInstances.json b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/RelatedInstances/CreateInstanceGroupNoRelatedInstances.json
new file mode 100644
index 0000000..5827c52
--- /dev/null
+++ b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/RelatedInstances/CreateInstanceGroupNoRelatedInstances.json
@@ -0,0 +1,16 @@
+{
+  "requestDetails": {
+    "modelInfo": {
+      "modelType": "instanceGroup",
+      "modelVersionId": "ddcbbf3d-f2c1-4ca0-8852-76a807285efc"
+    },
+    "requestInfo": {
+      "source": "VID",
+      "requestorId": "xxxxxx"
+    },
+    "requestParameters": {
+      "userParams": []
+    }
+  }
+}
+
diff --git a/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/RelatedInstances/CreateInstanceGroupRelatedInstanceModelVersionId.json b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/RelatedInstances/CreateInstanceGroupRelatedInstanceModelVersionId.json
new file mode 100644
index 0000000..d855078
--- /dev/null
+++ b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/RelatedInstances/CreateInstanceGroupRelatedInstanceModelVersionId.json
@@ -0,0 +1,25 @@
+{
+  "requestDetails": {
+    "modelInfo": {
+      "modelType": "instanceGroup",
+      "modelVersionId": "ddcbbf3d-f2c1-4ca0-8852-76a807285efc"
+    },
+    "requestInfo": {
+      "source": "VID",
+      "requestorId": "xxxxxx"
+    },
+    "relatedInstanceList": [
+      {
+        "relatedInstance": {
+          "instanceId": "ddcbbf3d-f2c1-4ca0-8852-76a807285efc",
+          "modelInfo": {
+            "modelType": "service"
+          }
+        }
+      }
+    ],
+    "requestParameters": {
+      "userParams": []
+    }
+  }
+}
\ No newline at end of file
diff --git a/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/RelatedInstances/CreateInstanceGroupService.json b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/RelatedInstances/CreateInstanceGroupService.json
new file mode 100644
index 0000000..0d33964
--- /dev/null
+++ b/mso-api-handlers/mso-api-handler-infra/src/test/resources/MsoRequestTest/RelatedInstances/CreateInstanceGroupService.json
@@ -0,0 +1,25 @@
+{
+  "requestDetails": {
+    "modelInfo": {
+      "modelType": "instanceGroup",
+      "modelVersionId": "ddcbbf3d-f2c1-4ca0-8852-76a807285efc"
+    },
+    "requestInfo": {
+      "source": "VID",
+      "requestorId": "xxxxxx"
+    },
+    "relatedInstanceList": [
+      {
+        "relatedInstance": {
+          "instanceId": "96f40d14-705d-40d9-b829-3dab90811321",
+          "modelInfo": {
+            "modelType": "vfModule"
+          }
+        }
+      }
+    ],
+    "requestParameters": {
+      "userParams": []
+    }
+  }
+}
\ No newline at end of file
diff --git a/mso-api-handlers/mso-api-handler-infra/src/test/resources/ServiceInstanceTest/AddMembers.json b/mso-api-handlers/mso-api-handler-infra/src/test/resources/ServiceInstanceTest/AddMembers.json
new file mode 100644
index 0000000..e9d056c
--- /dev/null
+++ b/mso-api-handlers/mso-api-handler-infra/src/test/resources/ServiceInstanceTest/AddMembers.json
@@ -0,0 +1,18 @@
+{
+  "requestDetails": {
+    "requestInfo": {
+      "source": "VID",
+      "requestorId": "xxxxxx"
+    },
+    "relatedInstanceList": [
+      {
+        "relatedInstance": {
+          "instanceId": "{the to be related vnf-id}",
+          "modelInfo": {
+            "modelType": "vnf"
+          }
+        }
+      }
+    ]
+  }
+}
diff --git a/mso-api-handlers/mso-api-handler-infra/src/test/resources/ServiceInstanceTest/CreateInstanceGroup.json b/mso-api-handlers/mso-api-handler-infra/src/test/resources/ServiceInstanceTest/CreateInstanceGroup.json
new file mode 100644
index 0000000..474c801
--- /dev/null
+++ b/mso-api-handlers/mso-api-handler-infra/src/test/resources/ServiceInstanceTest/CreateInstanceGroup.json
@@ -0,0 +1,26 @@
+{
+  "requestDetails": {
+    "modelInfo": {
+      "modelType": "instanceGroup",
+      "modelVersionId": "ddcbbf3d-f2c1-4ca0-8852-76a807285efc"
+    },
+    "requestInfo": {
+      "source": "VID",
+      "requestorId": "xxxxxx"
+    },
+    "relatedInstanceList": [
+      {
+        "relatedInstance": {
+          "instanceId": "ddcbbf3d-f2c1-4ca0-8852-76a807285efc",
+          "modelInfo": {
+            "modelType": "service",
+            "modelVersionId": "ddcbbf3d-f2c1-4ca0-8852-76a807285efc"
+          }
+        }
+      }
+    ],
+    "requestParameters": {
+      "userParams": []
+    }
+  }
+}
\ No newline at end of file
diff --git a/mso-api-handlers/mso-api-handler-infra/src/test/resources/ServiceInstanceTest/MembersRequestInfo.json b/mso-api-handlers/mso-api-handler-infra/src/test/resources/ServiceInstanceTest/MembersRequestInfo.json
new file mode 100644
index 0000000..58f83ef
--- /dev/null
+++ b/mso-api-handlers/mso-api-handler-infra/src/test/resources/ServiceInstanceTest/MembersRequestInfo.json
@@ -0,0 +1,17 @@
+{
+  "requestDetails": {
+  "requestInfo": {
+      "source": "VID"
+    },
+    "relatedInstanceList": [
+      {
+        "relatedInstance": {
+          "instanceId": "{the to be related vnf-id}",
+          "modelInfo": {
+            "modelType": "vnf"
+          }
+        }
+      }
+    ]
+  }
+}
diff --git a/mso-api-handlers/mso-api-handler-infra/src/test/resources/ServiceInstanceTest/RemoveMembers.json b/mso-api-handlers/mso-api-handler-infra/src/test/resources/ServiceInstanceTest/RemoveMembers.json
new file mode 100644
index 0000000..437f19d
--- /dev/null
+++ b/mso-api-handlers/mso-api-handler-infra/src/test/resources/ServiceInstanceTest/RemoveMembers.json
@@ -0,0 +1,18 @@
+{
+	"requestDetails": {
+	    "requestInfo": {
+	      "source": "VID",
+	      "requestorId": "xxxxxx"
+	    },
+	    "relatedInstanceList": [
+	      {
+	        "relatedInstance": {
+	          "instanceId": "{the to be removed as member vnf-id}",
+	          "modelInfo": {
+	            "modelType": "vnf"
+	          }
+	        }
+	      }
+	    ]
+	  }
+}