diff --git a/basyx/aas/model/aas.py b/basyx/aas/model/aas.py
index 943f1e25e..09740034c 100644
--- a/basyx/aas/model/aas.py
+++ b/basyx/aas/model/aas.py
@@ -73,10 +73,12 @@ def _check_constraint_del_spec_asset_id(self, _item_to_del: base.SpecificAssetId
             raise base.AASConstraintViolation(
                 131, "An AssetInformation has to have a globalAssetId or a specificAssetId")
 
-    def _get_global_asset_id(self):
+    @property
+    def global_asset_id(self):
         return self._global_asset_id
 
-    def _set_global_asset_id(self, global_asset_id: Optional[base.Identifier]):
+    @global_asset_id.setter
+    def global_asset_id(self, global_asset_id: Optional[base.Identifier]):
         if global_asset_id is None:
             if self.specific_asset_id is None or not self.specific_asset_id:
                 raise base.AASConstraintViolation(
@@ -85,8 +87,6 @@ def _set_global_asset_id(self, global_asset_id: Optional[base.Identifier]):
             _string_constraints.check_identifier(global_asset_id)
         self._global_asset_id = global_asset_id
 
-    global_asset_id = property(_get_global_asset_id, _set_global_asset_id)
-
     def __repr__(self) -> str:
         return "AssetInformation(assetKind={}, globalAssetId={}, specificAssetId={}, assetType={}, " \
                "defaultThumbnail={})".format(self.asset_kind, self._global_asset_id, str(self.specific_asset_id),
diff --git a/basyx/aas/model/base.py b/basyx/aas/model/base.py
index e96bf4a1d..e835c3262 100644
--- a/basyx/aas/model/base.py
+++ b/basyx/aas/model/base.py
@@ -599,7 +599,7 @@ class Referable(HasExtension, metaclass=abc.ABCMeta):
                   Default is an empty string, making it use the source of its ancestor, if possible.
     """
     @abc.abstractmethod
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self._id_short: Optional[NameType] = None
         self.display_name: Optional[MultiLanguageNameType] = dict()
@@ -1258,7 +1258,7 @@ class Identifiable(Referable, metaclass=abc.ABCMeta):
     :ivar ~.id: The globally unique id of the element.
     """
     @abc.abstractmethod
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self.administration: Optional[AdministrativeInformation] = None
         # The id attribute is set by all inheriting classes __init__ functions.
@@ -1516,7 +1516,7 @@ class HasKind(metaclass=abc.ABCMeta):
     :ivar _kind: Kind of the element: either type or instance. Default = :attr:`~ModellingKind.INSTANCE`.
     """
     @abc.abstractmethod
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self._kind: ModellingKind = ModellingKind.INSTANCE
 
@@ -1537,7 +1537,7 @@ class Qualifiable(Namespace, metaclass=abc.ABCMeta):
         qualifiable element.
     """
     @abc.abstractmethod
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self.namespace_element_sets: List[NamespaceSet] = []
         self.qualifier: NamespaceSet[Qualifier]
diff --git a/basyx/aas/model/submodel.py b/basyx/aas/model/submodel.py
index 160b63840..00608a29d 100644
--- a/basyx/aas/model/submodel.py
+++ b/basyx/aas/model/submodel.py
@@ -1111,8 +1111,7 @@ def __init__(self,
             [] if specific_asset_id is None else specific_asset_id,
             item_del_hook=self._check_constraint_del_spec_asset_id)
         self.global_asset_id: Optional[base.Identifier] = global_asset_id
-        self._entity_type: base.EntityType = entity_type
-        self._validate_asset_ids_for_entity_type(self.entity_type, self.global_asset_id, self.specific_asset_id)
+        self.entity_type: base.EntityType = entity_type
 
     def _check_constraint_del_spec_asset_id(self, _item_to_del: base.SpecificAssetId,
                                             _list: List[base.SpecificAssetId]) -> None:
@@ -1120,17 +1119,21 @@ def _check_constraint_del_spec_asset_id(self, _item_to_del: base.SpecificAssetId
             raise base.AASConstraintViolation(
                 131, "An AssetInformation has to have a globalAssetId or a specificAssetId")
 
-    def _get_entity_type(self) -> base.EntityType:
+    @property
+    def entity_type(self) -> base.EntityType:
         return self._entity_type
 
-    def _set_entity_type(self, entity_type: base.EntityType) -> None:
+    @entity_type.setter
+    def entity_type(self, entity_type: base.EntityType) -> None:
         self._validate_asset_ids_for_entity_type(entity_type, self.global_asset_id, self.specific_asset_id)
         self._entity_type = entity_type
 
-    def _get_global_asset_id(self):
+    @property
+    def global_asset_id(self):
         return self._global_asset_id
 
-    def _set_global_asset_id(self, global_asset_id: Optional[base.Identifier]):
+    @global_asset_id.setter
+    def global_asset_id(self, global_asset_id: Optional[base.Identifier]):
         self._validate_asset_ids_for_entity_type(self.entity_type, global_asset_id, self.specific_asset_id)
         self._global_asset_id = global_asset_id
 
@@ -1147,9 +1150,6 @@ def _validate_asset_ids_for_entity_type(entity_type: base.EntityType,
         if global_asset_id:
             _string_constraints.check_identifier(global_asset_id)
 
-    global_asset_id = property(_get_global_asset_id, _set_global_asset_id)
-    entity_type = property(_get_entity_type, _set_entity_type)
-
 
 class EventElement(SubmodelElement, metaclass=abc.ABCMeta):
     """