diff --git a/pycti/entities/opencti_case_incident.py b/pycti/entities/opencti_case_incident.py
index 40cc75ba9..1b0b81a58 100644
--- a/pycti/entities/opencti_case_incident.py
+++ b/pycti/entities/opencti_case_incident.py
@@ -690,6 +690,7 @@ def create(self, **kwargs):
         priority = kwargs.get("priority", None)
         x_opencti_stix_ids = kwargs.get("x_opencti_stix_ids", None)
         object_assignee = kwargs.get("objectAssignee", None)
+        object_participant = kwargs.get("objectParticipant", None)
         granted_refs = kwargs.get("objectOrganization", None)
         response_types = kwargs.get("response_types", None)
         x_opencti_workflow_id = kwargs.get("x_opencti_workflow_id", None)
@@ -717,6 +718,7 @@ def create(self, **kwargs):
                         "objectLabel": object_label,
                         "objectOrganization": granted_refs,
                         "objectAssignee": object_assignee,
+                        "objectParticipant": object_participant,
                         "objects": objects,
                         "externalReferences": external_references,
                         "revoked": revoked,
@@ -865,7 +867,12 @@ def import_from_stix2(self, **kwargs):
                 stix_object["x_opencti_assignee_ids"] = (
                     self.opencti.get_attribute_in_extension("assignee_ids", stix_object)
                 )
-
+            if "x_opencti_participant_ids" not in stix_object:
+                stix_object["x_opencti_participant_ids"] = (
+                    self.opencti.get_attribute_in_extension(
+                        "participant_ids", stix_object
+                    )
+                )
             return self.create(
                 stix_id=stix_object["id"],
                 createdBy=(
@@ -920,6 +927,11 @@ def import_from_stix2(self, **kwargs):
                     if "x_opencti_assignee_ids" in stix_object
                     else None
                 ),
+                objectParticipant=(
+                    stix_object["x_opencti_participant_ids"]
+                    if "x_opencti_participant_ids" in stix_object
+                    else None
+                ),
                 x_opencti_workflow_id=(
                     stix_object["x_opencti_workflow_id"]
                     if "x_opencti_workflow_id" in stix_object
diff --git a/pycti/entities/opencti_case_rfi.py b/pycti/entities/opencti_case_rfi.py
index afa4b5be6..da0efe5dd 100644
--- a/pycti/entities/opencti_case_rfi.py
+++ b/pycti/entities/opencti_case_rfi.py
@@ -674,6 +674,8 @@ def create(self, **kwargs):
         objects = kwargs.get("objects", None)
         object_marking = kwargs.get("objectMarking", None)
         object_label = kwargs.get("objectLabel", None)
+        object_assignee = kwargs.get("objectAssignee", None)
+        object_participant = kwargs.get("objectParticipant", None)
         external_references = kwargs.get("externalReferences", None)
         revoked = kwargs.get("revoked", None)
         confidence = kwargs.get("confidence", None)
@@ -709,6 +711,8 @@ def create(self, **kwargs):
                         "objectMarking": object_marking,
                         "objectLabel": object_label,
                         "objectOrganization": granted_refs,
+                        "objectAssignee": object_assignee,
+                        "objectParticipant": object_participant,
                         "objects": objects,
                         "externalReferences": external_references,
                         "revoked": revoked,
@@ -846,6 +850,16 @@ def import_from_stix2(self, **kwargs):
                 stix_object["x_opencti_workflow_id"] = (
                     self.opencti.get_attribute_in_extension("workflow_id", stix_object)
                 )
+            if "x_opencti_assignee_ids" not in stix_object:
+                stix_object["x_opencti_assignee_ids"] = (
+                    self.opencti.get_attribute_in_extension("assignee_ids", stix_object)
+                )
+            if "x_opencti_participant_ids" not in stix_object:
+                stix_object["x_opencti_participant_ids"] = (
+                    self.opencti.get_attribute_in_extension(
+                        "participant_ids", stix_object
+                    )
+                )
 
             return self.create(
                 stix_id=stix_object["id"],
@@ -889,6 +903,16 @@ def import_from_stix2(self, **kwargs):
                     if "x_opencti_granted_refs" in stix_object
                     else None
                 ),
+                objectAssignee=(
+                    stix_object["x_opencti_assignee_ids"]
+                    if "x_opencti_assignee_ids" in stix_object
+                    else None
+                ),
+                objectParticipant=(
+                    stix_object["x_opencti_participant_ids"]
+                    if "x_opencti_participant_ids" in stix_object
+                    else None
+                ),
                 x_opencti_workflow_id=(
                     stix_object["x_opencti_workflow_id"]
                     if "x_opencti_workflow_id" in stix_object
diff --git a/pycti/entities/opencti_case_rft.py b/pycti/entities/opencti_case_rft.py
index dddf601a3..49fee7f12 100644
--- a/pycti/entities/opencti_case_rft.py
+++ b/pycti/entities/opencti_case_rft.py
@@ -673,6 +673,8 @@ def create(self, **kwargs):
         objects = kwargs.get("objects", None)
         object_marking = kwargs.get("objectMarking", None)
         object_label = kwargs.get("objectLabel", None)
+        object_assignee = kwargs.get("objectAssignee", None)
+        object_participant = kwargs.get("objectParticipant", None)
         external_references = kwargs.get("externalReferences", None)
         revoked = kwargs.get("revoked", None)
         confidence = kwargs.get("confidence", None)
@@ -708,6 +710,8 @@ def create(self, **kwargs):
                         "objectMarking": object_marking,
                         "objectLabel": object_label,
                         "objectOrganization": granted_refs,
+                        "objectAssignee": object_assignee,
+                        "objectParticipant": object_participant,
                         "objects": objects,
                         "externalReferences": external_references,
                         "revoked": revoked,
@@ -845,7 +849,16 @@ def import_from_stix2(self, **kwargs):
                 stix_object["x_opencti_workflow_id"] = (
                     self.opencti.get_attribute_in_extension("workflow_id", stix_object)
                 )
-
+            if "x_opencti_assignee_ids" not in stix_object:
+                stix_object["x_opencti_assignee_ids"] = (
+                    self.opencti.get_attribute_in_extension("assignee_ids", stix_object)
+                )
+            if "x_opencti_participant_ids" not in stix_object:
+                stix_object["x_opencti_participant_ids"] = (
+                    self.opencti.get_attribute_in_extension(
+                        "participant_ids", stix_object
+                    )
+                )
             return self.create(
                 stix_id=stix_object["id"],
                 createdBy=(
@@ -893,6 +906,16 @@ def import_from_stix2(self, **kwargs):
                     if "x_opencti_granted_refs" in stix_object
                     else None
                 ),
+                objectAssignee=(
+                    stix_object["x_opencti_assignee_ids"]
+                    if "x_opencti_assignee_ids" in stix_object
+                    else None
+                ),
+                objectParticipant=(
+                    stix_object["x_opencti_participant_ids"]
+                    if "x_opencti_participant_ids" in stix_object
+                    else None
+                ),
                 x_opencti_workflow_id=(
                     stix_object["x_opencti_workflow_id"]
                     if "x_opencti_workflow_id" in stix_object
diff --git a/pycti/entities/opencti_task.py b/pycti/entities/opencti_task.py
index bdda9cea7..9aea86699 100644
--- a/pycti/entities/opencti_task.py
+++ b/pycti/entities/opencti_task.py
@@ -448,6 +448,7 @@ def create(self, **kwargs):
         object_marking = kwargs.get("objectMarking", None)
         object_label = kwargs.get("objectLabel", None)
         object_assignee = kwargs.get("objectAssignee", None)
+        object_participant = kwargs.get("objectParticipant", None)
         granted_refs = kwargs.get("objectOrganization", None)
         x_opencti_workflow_id = kwargs.get("x_opencti_workflow_id", None)
         update = kwargs.get("update", False)
@@ -478,6 +479,7 @@ def create(self, **kwargs):
                         "objectMarking": object_marking,
                         "objectOrganization": granted_refs,
                         "objectAssignee": object_assignee,
+                        "objectParticipant": object_participant,
                         "x_opencti_workflow_id": x_opencti_workflow_id,
                         "update": update,
                     }
@@ -628,7 +630,12 @@ def import_from_stix2(self, **kwargs):
                 stix_object["x_opencti_assignee_ids"] = (
                     self.opencti.get_attribute_in_extension("assignee_ids", stix_object)
                 )
-
+            if "x_opencti_participant_ids" not in stix_object:
+                stix_object["x_opencti_participant_ids"] = (
+                    self.opencti.get_attribute_in_extension(
+                        "participant_ids", stix_object
+                    )
+                )
             return self.create(
                 stix_id=stix_object["id"],
                 createdBy=(
@@ -661,6 +668,11 @@ def import_from_stix2(self, **kwargs):
                     if "x_opencti_assignee_ids" in stix_object
                     else None
                 ),
+                objectParticipant=(
+                    stix_object["x_opencti_participant_ids"]
+                    if "x_opencti_participant_ids" in stix_object
+                    else None
+                ),
                 x_opencti_workflow_id=(
                     stix_object["x_opencti_workflow_id"]
                     if "x_opencti_workflow_id" in stix_object