diff --git a/src/SOL005/NSLifecycleManagement/definitions/SOL005NSLifecycleManagement_def.yaml b/src/SOL005/NSLifecycleManagement/definitions/SOL005NSLifecycleManagement_def.yaml
index 82f94ba7b2c6ade07b48675d274e9cdc754c9f75..ebb374362d505625c1e570de1022c73b17748a85 100644
--- a/src/SOL005/NSLifecycleManagement/definitions/SOL005NSLifecycleManagement_def.yaml
+++ b/src/SOL005/NSLifecycleManagement/definitions/SOL005NSLifecycleManagement_def.yaml
@@ -1246,16 +1246,26 @@ definitions:
           Specify an existing VNF instance to be used in the NS.
           If needed, the VNF Profile to be used for this VNF
           instance is also provided.
+          The DF of the VNF instance shall match the VNF DF 
+          present in the associated VNF Profile.
         type: array
         items:
           $ref: "#/definitions/VnfInstanceData"
-      nestedNsInstanceId:
+      nestedNsInstanceData:
         description: >
           Specify an existing NS instance to be used as a nested
           NS within the NS.
+          If needed, the NS Profile to be used for this nested NS 
+          instance is also provided.
+          NOTE 2: The NS DF of each nested NS shall be one of the 
+          allowed flavours in the associated NSD (as referenced in the
+          nestedNsd attribute of the NSD of the NS to be instantiated).
+          NOTE 3: The NSD of each referenced NSs (i.e. each 
+          nestedInstanceId) shall match the one of the nested NSD in 
+          the composite NSD.
         type: array
         items:
-          $ref: "SOL005_def.yaml#/definitions/Identifier"
+          $ref: "#/definitions/NestedNsInstanceData"
       localizationLanguage:
         description: >
           Defines the location constraints for the VNF to be
@@ -1268,17 +1278,33 @@ definitions:
       additionalParamsForNs:
         description: >
           Allows the OSS/BSS to provide additional parameter(s)
-          at the NS level (as opposed to the VNF level, which is
-          covered in additionalParamsForVnf)..
+          at the composite NS level (as opposed to the VNF level, 
+          which is covered in additionalParamsForVnf), and as 
+          opposed to the nested NS level, which is covered in
+          additionalParamForNestedNs.
         $ref: "SOL005_def.yaml#/definitions/KeyValuePairs"
-      additionalParamsForVnf:
+      additionalParamForNestedNs:
         description: >
           Allows the OSS/BSS to provide additional parameter(s)
-          per VNF instance (as opposed to the NS level, which is
-          covered in additionalParamsForNs). This is for VNFs
+          per nested NS instance (as opposed to the composite NS
+          level, which is covered in additionalParamForNs, and as
+          opposed to the VNF level, which is covered in
+          additionalParamForVnf). This is for nested NS instances
           that are to be created by the NFVO as part of the NS
-          instantiation and not for existing VNF that are
-          referenced for reuse..
+          instantiation and not for existing nested NS instances that
+          are referenced for reuse.
+        type: array
+        items:
+          $ref: "#/definitions/ParamsForNestedNs"
+      additionalParamsForVnf:
+        description: >
+          Allows the OSS/BSS to provide additional parameter(s)
+          per VNF instance (as opposed to the composite NS level, 
+          which is covered in additionalParamsForNs and as opposed 
+          to the nested NS level, which is covered in 
+          additionalParamForNestedNs). This is for VNFs that are 
+          to be created by the NFVO as part of the NS instantiation 
+          and not for existing VNF that are referenced for reuse.
         type: array
         items:
           $ref: "#/definitions/ParamsForVnf"
@@ -1294,7 +1320,7 @@ definitions:
           default NS instantiation level as declared in the NSD
           shall be used.
         $ref: "SOL005_def.yaml#/definitions/IdentifierInNsd"
-      additionalAffinityOrAntiAffiniityRule:
+      additionalAffinityOrAntiAffinityRule:
         description: >
           Specifies additional affinity or anti-affinity constraint for
           the VNF instances to be instantiated as part of the NS