diff --git a/services/iaasalpha/src/stackit/iaasalpha/models/create_nic_payload.py b/services/iaasalpha/src/stackit/iaasalpha/models/create_nic_payload.py
index 13b72478..318601c4 100644
--- a/services/iaasalpha/src/stackit/iaasalpha/models/create_nic_payload.py
+++ b/services/iaasalpha/src/stackit/iaasalpha/models/create_nic_payload.py
@@ -50,7 +50,7 @@ class CreateNicPayload(BaseModel):
         default=None, description="Object that represents an IP address."
     )
     ipv6: Optional[Annotated[str, Field(strict=True)]] = Field(
-        default=None, description="Object that represents an IPv6 address."
+        default=None, description="String that represents an IPv6 address."
     )
     labels: Optional[Dict[str, Any]] = Field(
         default=None,
diff --git a/services/iaasalpha/src/stackit/iaasalpha/models/nic.py b/services/iaasalpha/src/stackit/iaasalpha/models/nic.py
index 48fe4bc4..5f6bd26a 100644
--- a/services/iaasalpha/src/stackit/iaasalpha/models/nic.py
+++ b/services/iaasalpha/src/stackit/iaasalpha/models/nic.py
@@ -50,7 +50,7 @@ class NIC(BaseModel):
         default=None, description="Object that represents an IP address."
     )
     ipv6: Optional[Annotated[str, Field(strict=True)]] = Field(
-        default=None, description="Object that represents an IPv6 address."
+        default=None, description="String that represents an IPv6 address."
     )
     labels: Optional[Dict[str, Any]] = Field(
         default=None,
diff --git a/services/iaasalpha/src/stackit/iaasalpha/models/project.py b/services/iaasalpha/src/stackit/iaasalpha/models/project.py
index bd674dc2..073520a4 100644
--- a/services/iaasalpha/src/stackit/iaasalpha/models/project.py
+++ b/services/iaasalpha/src/stackit/iaasalpha/models/project.py
@@ -44,7 +44,9 @@ class Project(BaseModel):
     )
     internet_access: Optional[StrictBool] = Field(default=None, alias="internetAccess")
     openstack_project_id: Optional[Annotated[str, Field(min_length=32, strict=True, max_length=32)]] = Field(
-        default=None, description="The identifier (ID) of an OpenStack project.", alias="openstackProjectId"
+        default=None,
+        description="The identifier (ID) of the OpenStack project in the main region eu01.",
+        alias="openstackProjectId",
     )
     project_id: Annotated[str, Field(min_length=36, strict=True, max_length=36)] = Field(
         description="Universally Unique Identifier (UUID).", alias="projectId"
@@ -115,10 +117,12 @@ def to_dict(self) -> Dict[str, Any]:
           are ignored.
         * OpenAPI `readOnly` fields are excluded.
         * OpenAPI `readOnly` fields are excluded.
+        * OpenAPI `readOnly` fields are excluded.
         """
         excluded_fields: Set[str] = set(
             [
                 "created_at",
+                "openstack_project_id",
                 "updated_at",
             ]
         )
diff --git a/services/iaasalpha/src/stackit/iaasalpha/models/server_network.py b/services/iaasalpha/src/stackit/iaasalpha/models/server_network.py
index 29c3da3b..f6a52bed 100644
--- a/services/iaasalpha/src/stackit/iaasalpha/models/server_network.py
+++ b/services/iaasalpha/src/stackit/iaasalpha/models/server_network.py
@@ -37,7 +37,7 @@ class ServerNetwork(BaseModel):
         default=None, description="Object that represents an IP address."
     )
     ipv6: Optional[Annotated[str, Field(strict=True)]] = Field(
-        default=None, description="Object that represents an IPv6 address."
+        default=None, description="String that represents an IPv6 address."
     )
     mac: Annotated[str, Field(strict=True)] = Field(description="Object that represents an MAC address.")
     network_id: Annotated[str, Field(min_length=36, strict=True, max_length=36)] = Field(