diff --git a/basyx/aas/model/aas.py b/basyx/aas/model/aas.py
index aa7b63f05..9edf891ea 100644
--- a/basyx/aas/model/aas.py
+++ b/basyx/aas/model/aas.py
@@ -69,17 +69,8 @@ def __init__(self,
             item_del_hook=self._check_constraint_del_spec_asset_id
         )
         self._global_asset_id: Optional[base.Identifier] = global_asset_id
-        self._validate_asset_ids(global_asset_id, bool(specific_asset_id))
-
-    def _check_constraint_set_spec_asset_id(self, items_to_replace: List[base.SpecificAssetId],
-                                            new_items: List[base.SpecificAssetId],
-                                            old_list: List[base.SpecificAssetId]) -> None:
-        self._validate_asset_ids(self.global_asset_id,
-                                 len(old_list) - len(items_to_replace) + len(new_items) > 0)
-
-    def _check_constraint_del_spec_asset_id(self, _item_to_del: base.SpecificAssetId,
-                                            old_list: List[base.SpecificAssetId]) -> None:
-        self._validate_asset_ids(self.global_asset_id, len(old_list) > 1)
+        self._validate_global_asset_id(global_asset_id)
+        self._validate_aasd_131(global_asset_id, bool(specific_asset_id))
 
     @property
     def global_asset_id(self) -> Optional[base.Identifier]:
@@ -87,7 +78,8 @@ def global_asset_id(self) -> Optional[base.Identifier]:
 
     @global_asset_id.setter
     def global_asset_id(self, global_asset_id: Optional[base.Identifier]) -> None:
-        self._validate_asset_ids(global_asset_id, bool(self.specific_asset_id))
+        self._validate_global_asset_id(global_asset_id)
+        self._validate_aasd_131(global_asset_id, bool(self.specific_asset_id))
         self._global_asset_id = global_asset_id
 
     @property
@@ -99,8 +91,23 @@ def specific_asset_id(self, specific_asset_id: Iterable[base.SpecificAssetId]) -
         # constraints are checked via _check_constraint_set_spec_asset_id() in this case
         self._specific_asset_id[:] = specific_asset_id
 
+    def _check_constraint_set_spec_asset_id(self, items_to_replace: List[base.SpecificAssetId],
+                                            new_items: List[base.SpecificAssetId],
+                                            old_list: List[base.SpecificAssetId]) -> None:
+        self._validate_aasd_131(self.global_asset_id,
+                                len(old_list) - len(items_to_replace) + len(new_items) > 0)
+
+    def _check_constraint_del_spec_asset_id(self, _item_to_del: base.SpecificAssetId,
+                                            old_list: List[base.SpecificAssetId]) -> None:
+        self._validate_aasd_131(self.global_asset_id, len(old_list) > 1)
+
+    @staticmethod
+    def _validate_global_asset_id(global_asset_id: Optional[base.Identifier]) -> None:
+        if global_asset_id is not None:
+            _string_constraints.check_identifier(global_asset_id)
+
     @staticmethod
-    def _validate_asset_ids(global_asset_id: Optional[base.Identifier], specific_asset_id_nonempty: bool) -> None:
+    def _validate_aasd_131(global_asset_id: Optional[base.Identifier], specific_asset_id_nonempty: bool) -> None:
         if global_asset_id is None and not specific_asset_id_nonempty:
             raise base.AASConstraintViolation(131,
                                               "An AssetInformation has to have a globalAssetId or a specificAssetId")
diff --git a/basyx/aas/model/submodel.py b/basyx/aas/model/submodel.py
index 36fdce48f..af9c074fe 100644
--- a/basyx/aas/model/submodel.py
+++ b/basyx/aas/model/submodel.py
@@ -1115,21 +1115,8 @@ def __init__(self,
             item_set_hook=self._check_constraint_set_spec_asset_id,
             item_del_hook=self._check_constraint_del_spec_asset_id
         )
-        self._validate_asset_ids(entity_type, global_asset_id, bool(specific_asset_id))
-
-    def _check_constraint_add_spec_asset_id(self, _new_item: base.SpecificAssetId,
-                                            _old_list: List[base.SpecificAssetId]) -> None:
-        self._validate_asset_ids(self.entity_type, self.global_asset_id, True)
-
-    def _check_constraint_set_spec_asset_id(self, items_to_replace: List[base.SpecificAssetId],
-                                            new_items: List[base.SpecificAssetId],
-                                            old_list: List[base.SpecificAssetId]) -> None:
-        self._validate_asset_ids(self.entity_type, self.global_asset_id,
-                                 len(old_list) - len(items_to_replace) + len(new_items) > 0)
-
-    def _check_constraint_del_spec_asset_id(self, _item_to_del: base.SpecificAssetId,
-                                            old_list: List[base.SpecificAssetId]) -> None:
-        self._validate_asset_ids(self.entity_type, self.global_asset_id, len(old_list) > 1)
+        self._validate_global_asset_id(global_asset_id)
+        self._validate_aasd_014(entity_type, global_asset_id, bool(specific_asset_id))
 
     @property
     def entity_type(self) -> base.EntityType:
@@ -1137,7 +1124,7 @@ def entity_type(self) -> base.EntityType:
 
     @entity_type.setter
     def entity_type(self, entity_type: base.EntityType) -> None:
-        self._validate_asset_ids(entity_type, self.global_asset_id, bool(self.specific_asset_id))
+        self._validate_aasd_014(entity_type, self.global_asset_id, bool(self.specific_asset_id))
         self._entity_type = entity_type
 
     @property
@@ -1146,7 +1133,8 @@ def global_asset_id(self) -> Optional[base.Identifier]:
 
     @global_asset_id.setter
     def global_asset_id(self, global_asset_id: Optional[base.Identifier]) -> None:
-        self._validate_asset_ids(self.entity_type, global_asset_id, bool(self.specific_asset_id))
+        self._validate_global_asset_id(global_asset_id)
+        self._validate_aasd_014(self.entity_type, global_asset_id, bool(self.specific_asset_id))
         self._global_asset_id = global_asset_id
 
     @property
@@ -1158,10 +1146,29 @@ def specific_asset_id(self, specific_asset_id: Iterable[base.SpecificAssetId]) -
         # constraints are checked via _check_constraint_set_spec_asset_id() in this case
         self._specific_asset_id[:] = specific_asset_id
 
+    def _check_constraint_add_spec_asset_id(self, _new_item: base.SpecificAssetId,
+                                            _old_list: List[base.SpecificAssetId]) -> None:
+        self._validate_aasd_014(self.entity_type, self.global_asset_id, True)
+
+    def _check_constraint_set_spec_asset_id(self, items_to_replace: List[base.SpecificAssetId],
+                                            new_items: List[base.SpecificAssetId],
+                                            old_list: List[base.SpecificAssetId]) -> None:
+        self._validate_aasd_014(self.entity_type, self.global_asset_id,
+                                len(old_list) - len(items_to_replace) + len(new_items) > 0)
+
+    def _check_constraint_del_spec_asset_id(self, _item_to_del: base.SpecificAssetId,
+                                            old_list: List[base.SpecificAssetId]) -> None:
+        self._validate_aasd_014(self.entity_type, self.global_asset_id, len(old_list) > 1)
+
     @staticmethod
-    def _validate_asset_ids(entity_type: base.EntityType,
-                            global_asset_id: Optional[base.Identifier],
-                            specific_asset_id_nonempty: bool) -> None:
+    def _validate_global_asset_id(global_asset_id: Optional[base.Identifier]) -> None:
+        if global_asset_id is not None:
+            _string_constraints.check_identifier(global_asset_id)
+
+    @staticmethod
+    def _validate_aasd_014(entity_type: base.EntityType,
+                           global_asset_id: Optional[base.Identifier],
+                           specific_asset_id_nonempty: bool) -> None:
         if entity_type == base.EntityType.SELF_MANAGED_ENTITY and global_asset_id is None \
                 and not specific_asset_id_nonempty:
             raise base.AASConstraintViolation(
@@ -1171,9 +1178,6 @@ def _validate_asset_ids(entity_type: base.EntityType,
             raise base.AASConstraintViolation(
                 14, "A co-managed entity has to have neither a globalAssetId nor a specificAssetId")
 
-        if global_asset_id is not None:
-            _string_constraints.check_identifier(global_asset_id)
-
 
 class EventElement(SubmodelElement, metaclass=abc.ABCMeta):
     """