diff --git a/src/lib/orionld/serviceRoutines/orionldPutAttribute.cpp b/src/lib/orionld/serviceRoutines/orionldPutAttribute.cpp
index 0487ad1974..46c1197ada 100644
--- a/src/lib/orionld/serviceRoutines/orionldPutAttribute.cpp
+++ b/src/lib/orionld/serviceRoutines/orionldPutAttribute.cpp
@@ -56,6 +56,7 @@ extern "C"
 #include "orionld/forwarding/distOpSuccess.h"                    // distOpSuccess
 #include "orionld/notifications/alteration.h"                    // alteration
 #include "orionld/notifications/previousValuePopulate.h"         // previousValuePopulate
+#include "orionld/notifications/sysAttrsStrip.h"                 // sysAttrsStrip
 #include "orionld/serviceRoutines/orionldPutAttribute.h"         // Own Interface
 
 
@@ -96,12 +97,17 @@ bool orionldPutAttribute(void)
   char*   attrLongNameEq        = kaStrdup(&orionldState.kalloc, attrLongName);
   KjNode* apiAttributeAsEntityP = NULL;
   KjNode* dbEntityCopy          = NULL;
-  KjNode* apiEntityP            = NULL;
   KjNode* oldAttrP              = NULL;
   KjNode* apiAttributeClone     = NULL;
   bool    entityNotFoundLocally = false;
   bool    attrNotFoundLocally   = false;
 
+  OrionldAlteration* alterationP                = NULL;
+  KjNode*            finalApiEntityWithSysAttrs = NULL;
+  KjNode*            finalApiEntity             = NULL;
+  KjNode*            createdAtP                 = NULL;
+  KjNode*            modifiedAtP                 = NULL;
+
   dotForEq(attrLongNameEq);
 
   if (dbEntityP == NULL)
@@ -198,6 +204,7 @@ bool orionldPutAttribute(void)
 
   // Set creDate (mongocAttributeReplace sets modDate)
   dbModelAttributeCreatedAtSet(orionldState.requestTree, createdAt);
+  kjTreeLog(orionldState.requestTree, "orionldState.requestTree", LmtSR);
 
   // Write to mongo
   if (mongocAttributeReplace(entityId, orionldState.requestTree, &detail) == false)
@@ -233,15 +240,16 @@ bool orionldPutAttribute(void)
   // o Insert a copy of the attribute that was replaced (new copy)
   //
   dbEntityCopy = kjClone(orionldState.kjsonP, dbEntityP);
-  apiEntityP   = dbModelToApiEntity2(dbEntityCopy, false, RF_NORMALIZED, NULL, false, &orionldState.pd);
 
-  if (apiEntityP == NULL)
+  finalApiEntityWithSysAttrs = dbModelToApiEntity2(dbEntityCopy, true, RF_NORMALIZED, NULL, false, &orionldState.pd);
+
+  if (finalApiEntityWithSysAttrs == NULL)
   {
     LM_E(("dbModelToApiEntity unable to convert DB Entity '%s' to API Entity (%s: %s)", entityId, orionldState.pd.title, orionldState.pd.detail));
     goto response;
   }
 
-  oldAttrP = kjLookup(apiEntityP, attrLongName);
+  oldAttrP = kjLookup(finalApiEntityWithSysAttrs, attrLongName);
   if (oldAttrP == NULL)
   {
     LM_E(("Unable to find the attribute '%s' in the entity '%s'", attrLongName, entityId));
@@ -254,10 +262,32 @@ bool orionldPutAttribute(void)
     LM_E(("Unable to clone the attribute '%s' in the entity '%s'", attrLongName, entityId));
     goto response;
   }
-  kjChildRemove(apiEntityP, oldAttrP);
-  kjChildAdd(apiEntityP, apiAttributeClone);
+  kjChildRemove(finalApiEntityWithSysAttrs, oldAttrP);
+  kjChildAdd(finalApiEntityWithSysAttrs, apiAttributeClone);
+
+  // Now get createdAt/modifiedAt from oldAttrP
+  createdAtP  = kjLookup(oldAttrP, "createdAt");
+  modifiedAtP = kjLookup(oldAttrP, "modifiedAt");
+
+  if (createdAtP != NULL)
+  {
+    kjChildRemove(oldAttrP, createdAtP);
+    kjChildAdd(apiAttributeClone, createdAtP);
+  }
+
+  if (modifiedAtP != NULL)
+  {
+    kjChildRemove(oldAttrP, modifiedAtP);
+    kjChildAdd(apiAttributeClone, modifiedAtP);
+  }
+
+
+  finalApiEntity = kjClone(orionldState.kjsonP, finalApiEntityWithSysAttrs);  // Check for NULL !
+  sysAttrsStrip(finalApiEntity);
+
 
-  alteration(entityId, entityType, apiEntityP, apiAttributeAsEntityP, dbEntityP);
+  alterationP = alteration(entityId, entityType, finalApiEntity, apiAttributeAsEntityP, dbEntityP);
+  alterationP->finalApiEntityWithSysAttrsP = finalApiEntityWithSysAttrs;
 
  response:
   if (distOpList != NULL)
diff --git a/test/functionalTest/cases/0000_ngsild/ngsild_subscription_with_sysAttrs.test b/test/functionalTest/cases/0000_ngsild/ngsild_subscription_with_sysAttrs.test
index a6c0e5f5ce..163c524ac1 100644
--- a/test/functionalTest/cases/0000_ngsild/ngsild_subscription_with_sysAttrs.test
+++ b/test/functionalTest/cases/0000_ngsild/ngsild_subscription_with_sysAttrs.test
@@ -235,6 +235,24 @@ echo
 echo
 
 
+echo "17. PUT /ngsi-ld/v1/entities/urn:E1/attrs/P1"
+echo "============================================"
+payload='{
+  "value": 17
+}'
+orionCurl --url /ngsi-ld/v1/entities/urn:E1/attrs/P1 --payload "$payload" -X PUT
+echo
+echo
+
+
+echo "18. See the notification in the accumulator, especially the sysAttrs (createdAt+modifiedAt)"
+echo "==========================================================================================="
+accumulatorDump
+accumulatorReset
+echo
+echo
+
+
 echo "19. PUT /ngsi-ld/v1/entities/urn:E1"
 echo "==================================="
 payload='{
@@ -598,6 +616,47 @@ Ngsild-Attribute-Format: Normalized
 =======================================
 
 
+17. PUT /ngsi-ld/v1/entities/urn:E1/attrs/P1
+============================================
+HTTP/1.1 204 No Content
+Date: REGEX(.*)
+
+
+
+18. See the notification in the accumulator, especially the sysAttrs (createdAt+modifiedAt)
+===========================================================================================
+POST http://REGEX(.*)/notify?subscriptionId=urn:S1
+Content-Length: 388
+User-Agent: orionld/REGEX(.*)
+Host: tux
+Accept: application/json
+Content-Type: application/json
+Link: <https://uri.etsi.org/ngsi-ld/v1/ngsi-ld-core-context.jsonld>; rel="http://www.w3.org/ns/json-ld#context"; type="application/ld+json"
+Ngsild-Attribute-Format: Normalized
+
+{
+    "data": [
+        {
+            "P1": {
+                "createdAt": "202REGEX(.*)Z",
+                "modifiedAt": "202REGEX(.*)Z",
+                "type": "Property",
+                "value": 17
+            },
+            "createdAt": "202REGEX(.*)Z",
+            "id": "urn:E1",
+            "modifiedAt": "202REGEX(.*)Z",
+            "type": "T"
+        }
+    ],
+    "id": "urn:ngsi-ld:Notification:REGEX(.*)",
+    "notifiedAt": "202REGEX(.*)Z",
+    "subscriptionId": "urn:S1",
+    "type": "Notification"
+}
+=======================================
+
+
 19. PUT /ngsi-ld/v1/entities/urn:E1
 ===================================
 HTTP/1.1 204 No Content