diff --git a/src/yang/etsi-nfv-ns.yang b/src/yang/etsi-nfv-ns.yang
index 2b12612efee6dcca134df2ed374de0e9ffa9713e..94f8cfcabb23d45b8ce56bb06a72153a0d58daf6 100644
--- a/src/yang/etsi-nfv-ns.yang
+++ b/src/yang/etsi-nfv-ns.yang
@@ -418,7 +418,7 @@ submodule etsi-nfv-ns {
       list nfp-position-element {
         key "id";
 
-	min-elements 1;
+        min-elements 1;
 
         leaf id {
           type string;
@@ -468,18 +468,19 @@ submodule etsi-nfv-ns {
                CpdInConstituentElement information element";
           }
 
-        choice constituent-cpd-id {
-          container vnf {
-            leaf vnfd-id {
-              must ". = deref(../../vnfd-profile-id)/../vnfd-id" {
-              }
-              type leafref {
-                path "/nfv:nfv/nfv:vnfd/nfv:id";
+          choice constituent-cpd-id {
+            container vnf {
+              leaf vnfd-id {
+                must ". = deref(../../vnfd-profile-id)/../vnfd-id" {
+                }
+                type leafref {
+                  path "/nfv:nfv/nfv:vnfd/nfv:id";
+                }
               }
-            }
-            leaf cpd-id {
-              type leafref {
-                path "deref(../vnfd-id)/../nfv:ext-cpd/nfv:id";
+              leaf cpd-id {
+                type leafref {
+                  path "deref(../vnfd-id)/../nfv:ext-cpd/nfv:id";
+                }
               }
             }
             container pnf {
@@ -487,16 +488,13 @@ submodule etsi-nfv-ns {
                 must ". = deref(../../pnfd-profile-id)/../pnfd-id" {
                 }
                 type leafref {
-                  path "../../../../../../pnfd/id";
+                  path "/nfv:nfv/nfv:pnfd/nfv:id";
                 }
               }
-              type leafref {
-                path "/nfv:nfv/nfv:pnfd/nfv:id";
-              }
-            }
-            leaf pnf-cpd-id {
-              type leafref {
-                path "deref(../pnfd-id)/../nfv:ext-cpd/nfv:id";
+              leaf pnf-cpd-id {
+                type leafref {
+                  path "deref(../pnfd-id)/../nfv:ext-cpd/nfv:id";
+                }
               }
             }
             container ns {
@@ -525,7 +523,7 @@ submodule etsi-nfv-ns {
                CpdInConstituentElement information element";
           }
           description
-            "Identifies a CPD or SAPD in the context of a profile
+            "Specifies a CPD or SAPD in the context of a profile
              of an NS constituent element.";
           reference
             "GS NFV IFA014: Section 6.4.6.2 NfpPositionElement
diff --git a/src/yang/etsi-nfv-nsd.yang b/src/yang/etsi-nfv-nsd.yang
index ad3d05df04327b00f511d3ffc17da85101f14e96..f74f00abe9eccfc4384cfd86f98ede8f34d50d80 100644
--- a/src/yang/etsi-nfv-nsd.yang
+++ b/src/yang/etsi-nfv-nsd.yang
@@ -4,7 +4,7 @@ module etsi-nfv-nsd {
   prefix nsd;
 
   import etsi-nfv-descriptors {
-    prefix vnf;
+    prefix nfv;
   }
 
   organization
@@ -13,6 +13,11 @@ module etsi-nfv-nsd {
   description
     "Network Services Descriptors";
 
+  revision 2019-10-01 {
+    description
+      "Revision 2.7.1.
+       NSD according to ETSI GS NFV-IFA 014 Ed271v264.";
+  }
   revision 2019-04-25 {
     description
       "Initial revision.
@@ -23,7 +28,7 @@ module etsi-nfv-nsd {
     list nsd {
       key "id";
       max-elements 1;
-      uses vnf:nsd;
+      uses nfv:nsd;
       description
 	"The NSD information element is a deployment template whose
          instances are used by the NFVO for the lifecycle management