diff --git a/osm_lcm/ns.py b/osm_lcm/ns.py
index 704b921..07f5845 100644
--- a/osm_lcm/ns.py
+++ b/osm_lcm/ns.py
@@ -278,10 +278,12 @@
             raise LcmException("Error parsing Jinja2 to cloud-init content at vnfd[id={}]:vdu[id={}]: {}".
                                format(vnfd["id"], vdu["id"], e))
 
-    def _ns_params_2_RO(self, ns_params, nsd, vnfd_dict, n2vc_key_list):
+    def _ns_params_2_RO(self, ns_params, nsd, vnfd_dict, db_vnfrs, n2vc_key_list):
         """
         Creates a RO ns descriptor from OSM ns_instantiate params
         :param ns_params: OSM instantiate params
+        :param vnfd_dict: database content of vnfds, indexed by id (not _id). {id: {vnfd_object}, ...}
+        :param db_vnfrs: database content of vnfrs, indexed by member-vnf-index. {member-vnf-index: {vnfr_object}, ...}
         :return: The RO ns descriptor
         """
         vim_2_RO = {}
@@ -343,6 +345,13 @@
             "wim_account": wim_account_2_RO(ns_params.get("wimAccountId")),
             # "scenario": ns_params["nsdId"],
         }
+        # set vim_account of each vnf if different from general vim_account.
+        # Get this information from <vnfr> database content, key vim-account-id
+        # Vim account can be set by placement_engine and it may be different from
+        # the instantiate parameters (vnfs.member-vnf-index.datacenter).
+        for vnf_index, vnfr in db_vnfrs.items():
+            if vnfr.get("vim-account-id") and vnfr["vim-account-id"] != ns_params["vimAccountId"]:
+                populate_dict(RO_ns_params, ("vnfs", vnf_index, "datacenter"), vim_account_2_RO(vnfr["vim-account-id"]))
 
         n2vc_key_list = n2vc_key_list or []
         for vnfd_ref, vnfd in vnfd_dict.items():
@@ -391,9 +400,6 @@
             else:
                 raise LcmException("Invalid instantiate parameter vnf:member-vnf-index={} is not present at nsd:"
                                    "constituent-vnfd".format(vnf_params["member-vnf-index"]))
-            if vnf_params.get("vimAccountId"):
-                populate_dict(RO_ns_params, ("vnfs", vnf_params["member-vnf-index"], "datacenter"),
-                              vim_account_2_RO(vnf_params["vimAccountId"]))
 
             for vdu_params in get_iterable(vnf_params, "vdu"):
                 # TODO feature 1417: check that this VDU exist and it is not a PDU
@@ -752,6 +758,19 @@
 
     async def instantiate_RO(self, logging_text, nsr_id, nsd, db_nsr, db_nslcmop, db_vnfrs, db_vnfds_ref,
                              n2vc_key_list, stage):
+        """
+        Instantiate at RO
+        :param logging_text: preffix text to use at logging
+        :param nsr_id: nsr identity
+        :param nsd: database content of ns descriptor
+        :param db_nsr: database content of ns record
+        :param db_nslcmop: database content of ns operation, in this case, 'instantiate'
+        :param db_vnfrs:
+        :param db_vnfds_ref: database content of vnfds, indexed by id (not _id). {id: {vnfd_object}, ...}
+        :param n2vc_key_list: ssh-public-key list to be inserted to management vdus via cloud-init
+        :param stage: list with 3 items: [general stage, tasks, vim_specific]. This task will write over vim_specific
+        :return: None or exception
+        """
         try:
             db_nsr_update = {}
             RO_descriptor_number = 0   # number of descriptors created at RO
@@ -899,7 +918,7 @@
                             await asyncio.wait(task_dependency, timeout=3600)
 
                 stage[2] = "Checking instantiation parameters."
-                RO_ns_params = self._ns_params_2_RO(ns_params, nsd, db_vnfds_ref, n2vc_key_list)
+                RO_ns_params = self._ns_params_2_RO(ns_params, nsd, db_vnfds_ref, db_vnfrs, n2vc_key_list)
                 stage[2] = "Deploying ns at VIM."
                 db_nsr_update["detailed-status"] = " ".join(stage)
                 self.update_db_2("nsrs", nsr_id, db_nsr_update)
diff --git a/osm_lcm/tests/test_db_descriptors.py b/osm_lcm/tests/test_db_descriptors.py
index a7f4ccf..b41e644 100644
--- a/osm_lcm/tests/test_db_descriptors.py
+++ b/osm_lcm/tests/test_db_descriptors.py
@@ -753,15 +753,44 @@
         projects_write:
         - 25b5aebf-3da1-49ed-99de-1d2b4a86d6e4
     _id: ea958ba5-4e58-4405-bf42-6e3be15d4c3a
-    description: Openstack site 2, based on Mirantis, also called DSS9000-1, with
-        tenant tid
-    name: ost2-mrt-tid
+    description: some description here
+    name: vim1
     schema_version: '1.1'
     vim_password: 5g0yGX86qIhprX86YTMcpg==
     vim_tenant_name: osm
     vim_type: openstack
     vim_url: http://10.95.87.162:5000/v2.0
     vim_user: osm
+-   _admin:
+        created: 1566818150.3024442
+        current_operation: 0
+        deployed:
+            RO: 9ac17c0d-4265-4333-843b-c3cbd1f93f88
+            RO-account: 011895dc-ab34-4c9f-b06f-401a8ffb073b
+        detailed-status: Done
+        modified: 1566818150.3024442
+        operationalState: ENABLED
+        operations:
+        -   detailed-status: Done
+            lcmOperationType: create
+            operationParams: null
+            operationState: COMPLETED
+            startTime: 1566818150.3025382
+            statusEnteredTime: 1566818150.3025382
+            worker: 86434c2948e2
+        projects_read:
+        - 25b5aebf-3da1-49ed-99de-1d2b4a86d6e4
+        projects_write:
+        - 25b5aebf-3da1-49ed-99de-1d2b4a86d6e4
+    _id: 05357241-1a01-416f-9e02-af20f65f51cd
+    description: No description
+    name: vim2
+    schema_version: '1.1'
+    vim_password: 5g0yGX86qIhprX86YTMcpg==
+    vim_tenant_name: osm
+    vim_type: dumy
+    vim_url: http://10.95.88.162:5000/v2.0
+    vim_user: osm
 """
 
 db_k8sclusters_text = """
diff --git a/osm_lcm/tests/test_ns.py b/osm_lcm/tests/test_ns.py
index 23fa94b..e35afc6 100644
--- a/osm_lcm/tests/test_ns.py
+++ b/osm_lcm/tests/test_ns.py
@@ -261,9 +261,12 @@
         # TODO add a terminate
 
     def test_ns_params_2_RO(self):
-        vim = self.db.get_list("vim_accounts")[0]
-        vim_id = vim["_id"]
-        ro_vim_id = vim["_admin"]["deployed"]["RO"]
+        vims = self.db.get_list("vim_accounts")
+        vim_id = vims[0]["_id"]
+        ro_vim_id = vims[0]["_admin"]["deployed"]["RO"]
+        vim_id2 = vims[1]["_id"]
+        ro_vim_id2 = vims[1]["_admin"]["deployed"]["RO"]
+
         ns_params = {"vimAccountId": vim_id}
         mgmt_interface = {"cp": "cp"}
         vdu = [{"id": "vdu_id", "interface": [{"external-connection-point-ref": "cp"}]}]
@@ -277,13 +280,18 @@
                   "vnf-configuration": {"config-access": {"ssh-access": {"required": True, "default_user": "U"}}}},
         }
         nsd = {"constituent-vnfd": []}
+        db_vnfrs = {}
         for k in vnfd_dict.keys():
-            nsd["constituent-vnfd"].append({"vnfd-id-ref": k, "member-vnf-index": k})
+            nsd["constituent-vnfd"].append({"vnfd-id-ref": k, "member-vnf-index": "member " + k})
+            db_vnfrs["member " + k] = {"vim-account-id": vim_id2 if k == "1" else vim_id}
 
         n2vc_key_list = ["key"]
-        ro_ns_params = self.my_ns._ns_params_2_RO(ns_params, nsd, vnfd_dict, n2vc_key_list)
+        ro_ns_params = self.my_ns._ns_params_2_RO(ns_params, nsd, vnfd_dict, db_vnfrs, n2vc_key_list)
         ro_params_expected = {'wim_account': None, "datacenter": ro_vim_id,
-                              "vnfs": {"5": {"vdus": {"vdu_id": {"mgmt_keys": n2vc_key_list}}}}}
+                              "vnfs": {
+                                  "member 5": {"vdus": {"vdu_id": {"mgmt_keys": n2vc_key_list}}},
+                                  "member 1": {"datacenter": ro_vim_id2}
+                              }}
         self.assertEqual(ro_ns_params, ro_params_expected)
 
     # Test scale() and related methods