diff --git a/packages/helpermodules/command.py b/packages/helpermodules/command.py
index 505adc4adf..e39ac1dbbc 100644
--- a/packages/helpermodules/command.py
+++ b/packages/helpermodules/command.py
@@ -18,7 +18,7 @@
 from helpermodules.measurement_logging.process_log import get_daily_log, get_monthly_log, get_yearly_log
 from helpermodules.messaging import MessageType, pub_user_message, pub_error_global
 from helpermodules.parse_send_debug import parse_send_debug_data
-from helpermodules.pub import Pub
+from helpermodules.pub import Pub, pub_single
 from helpermodules.subdata import SubData
 from helpermodules.utils.topic_parser import decode_payload
 from control import bat, bridge, chargelog, data, ev, counter, counter_all, pv
@@ -794,6 +794,13 @@ def __on_message_rm(self, client, userdata, msg):
                 topic = type_to_topic_mapping(payload["type"])
                 data.data.counter_all_data.hierarchy_remove_item(payload["id"])
                 client.subscribe(f'openWB/{topic}/{payload["id"]}/#', 2)
+            elif re.search("openWB/chargepoint/[0-9]+/config$", msg.topic) is not None:
+                payload = decode_payload(msg.payload)
+                if payload["type"] == "external_openwb":
+                    pub_single(
+                        f'openWB/set/internal_chargepoint/{payload["configuration"]["duo_num"]}/data/parent_cp',
+                        None,
+                        hostname=payload["configuration"]["ip_address"])
 
     def __on_message_max_id(self, client, userdata, msg):
         self.received_topics.append(msg.topic)
diff --git a/packages/helpermodules/setdata.py b/packages/helpermodules/setdata.py
index 3e656ccee5..d24c97e63b 100644
--- a/packages/helpermodules/setdata.py
+++ b/packages/helpermodules/setdata.py
@@ -1022,7 +1022,16 @@ def process_internal_chargepoint_topic(self, msg):
             if "data/cp_interruption_duration" in msg.topic:
                 self._validate_value(msg, int, [(0, float("inf"))])
             elif "data/parent_cp" in msg.topic:
-                self._validate_value(msg, str)
+                if decode_payload(msg.payload) is None:
+                    self._validate_value(msg, str)
+                else:
+                    for cp in subdata.SubData.cp_data.values():
+                        if cp.chargepoint.data.config.type == "internal_openwb":
+                            if int(get_index(msg.topic)) == cp.chargepoint.data.config.configuration["duo_num"]:
+                                self._validate_value(msg, str)
+                                break
+                    else:
+                        log.error("Kein interner Ladepunkt konfiguriert, dem ein parent_cp zugeordnet werden kann.")
             elif "data/set_current" in msg.topic:
                 self._validate_value(msg, float, [(0, 0), (6, 32)])
             elif "data/phases_to_use" in msg.topic:
diff --git a/packages/helpermodules/update_config.py b/packages/helpermodules/update_config.py
index 9964461a72..ea60bfd4fd 100644
--- a/packages/helpermodules/update_config.py
+++ b/packages/helpermodules/update_config.py
@@ -26,7 +26,7 @@
 
 
 class UpdateConfig:
-    DATASTORE_VERSION = 19
+    DATASTORE_VERSION = 20
     valid_topic = [
         "^openWB/bat/config/configured$",
         "^openWB/bat/set/charging_power_left$",
@@ -404,6 +404,8 @@ class UpdateConfig:
         ("openWB/general/range_unit", "km"),
         ("openWB/general/ripple_control_receiver/configured", False),
         ("openWB/graph/config/duration", 120),
+        ("openWB/internal_chargepoint/0/data/parent_cp", None),
+        ("openWB/internal_chargepoint/1/data/parent_cp", None),
         ("openWB/optional/et/active", False),
         ("openWB/optional/et/config/max_price", 0),
         ("openWB/optional/et/config/provider", {}),
@@ -496,7 +498,7 @@ def __pub_missing_defaults(self):
         # zwingend erforderliche Standardwerte setzen
         for topic, default_payload in self.default_topic:
             if topic not in self.all_received_topics.keys():
-                log.debug(f"Setzte Topic '{topic}' auf Standardwert '{str(default_payload)}'")
+                log.debug(f"Setze Topic '{topic}' auf Standardwert '{str(default_payload)}'")
                 Pub().pub(topic.replace("openWB/", "openWB/set/"), default_payload)
 
     def __update_version(self):
@@ -840,3 +842,17 @@ def convert_file(file):
         convert_file(f"/var/www/html/openWB/data/daily_log/{timecheck.create_timestamp_YYYYMMDD()}.json")
         convert_file(f"/var/www/html/openWB/data/monthly_log/{timecheck.create_timestamp_YYYYMM()}.json")
         Pub().pub("openWB/system/datastore_version", 19)
+
+    def upgrade_datastore_19(self) -> None:
+        for topic, payload in self.all_received_topics.items():
+            if re.search("openWB/internal_chargepoint/[0-1]/data/parent_cp", topic) is not None:
+                payload = decode_payload(payload)
+                for topic_cp, payload_cp in self.all_received_topics.items():
+                    payload_cp = decode_payload(payload_cp)
+                    if f"openWB/chargepoint/{payload}/config" == topic_cp:
+                        if payload_cp["type"] == "internal_openwb":
+                            if int(get_index(topic)) == payload_cp["configuration"]["duo_num"]:
+                                break
+                else:
+                    Pub().pub(topic, None)
+        Pub().pub("openWB/system/datastore_version", 20)