diff --git a/src/dsp_tools/commands/project/models/propertyclass.py b/src/dsp_tools/commands/project/models/propertyclass.py
index 2fd1d9af9..18a2d2e6c 100644
--- a/src/dsp_tools/commands/project/models/propertyclass.py
+++ b/src/dsp_tools/commands/project/models/propertyclass.py
@@ -11,7 +11,7 @@
 from dsp_tools.commands.project.models.model import Model
 from dsp_tools.models.datetimestamp import DateTimeStamp
 from dsp_tools.models.exceptions import BaseError
-from dsp_tools.models.langstring import LangString, Languages
+from dsp_tools.models.langstring import LangString
 from dsp_tools.utils.connection import Connection
 
 
@@ -134,14 +134,6 @@ def label(self, value: Optional[Union[LangString, str]]) -> None:
             raise BaseError("Not a valid LangString")
         self._changed.add("label")
 
-    def addLabel(self, lang: Union[Languages, str], value: str) -> None:
-        self._label[lang] = value
-        self._changed.add("label")
-
-    def rmLabel(self, lang: Union[Languages, str]) -> None:
-        del self._label[lang]
-        self._changed.add("label")
-
     @property
     def comment(self) -> LangString:
         return self._comment
@@ -158,14 +150,6 @@ def comment(self, value: Optional[LangString]) -> None:
             raise BaseError("Not a valid LangString")
         self._changed.add("comment")
 
-    def addComment(self, lang: Union[Languages, str], value: str) -> None:
-        self._comment[lang] = value
-        self._changed.add("comment")
-
-    def rmComment(self, lang: Union[Languages, str]) -> None:
-        del self._comment[lang]
-        self._changed.add("comment")
-
     @property
     def editable(self) -> bool:
         return self._editable
diff --git a/src/dsp_tools/commands/project/models/resourceclass.py b/src/dsp_tools/commands/project/models/resourceclass.py
index b3f5aa0dc..72e6b7273 100644
--- a/src/dsp_tools/commands/project/models/resourceclass.py
+++ b/src/dsp_tools/commands/project/models/resourceclass.py
@@ -18,7 +18,7 @@
 from dsp_tools.commands.project.models.model import Model
 from dsp_tools.models.datetimestamp import DateTimeStamp
 from dsp_tools.models.exceptions import BaseError
-from dsp_tools.models.langstring import LangString, Languages
+from dsp_tools.models.langstring import LangString
 from dsp_tools.utils.connection import Connection
 
 
@@ -330,9 +330,6 @@ class ResourceClass(Model):
     Methods
     -------
 
-    addLabel: Add a new label to the resource
-        addLabel(self, lang: Union[Languages, str], value: str) -> None
-
     getProperty: Get information about a property defined for this resource class
         getPropertery(prop_id: str) -> HasProperty
         returns a HasProperty-instance
@@ -456,14 +453,6 @@ def label(self, value: Optional[Union[LangString, str]]) -> None:
             raise BaseError("Not a valid LangString")
         self._changed.add("label")
 
-    def addLabel(self, lang: Union[Languages, str], value: str) -> None:
-        self._label[lang] = value
-        self._changed.add("label")
-
-    def rmLabel(self, lang: Union[Languages, str]) -> None:
-        del self._label[lang]
-        self._changed.add("label")
-
     @property
     def comment(self) -> LangString:
         return self._comment
@@ -480,14 +469,6 @@ def comment(self, value: Optional[LangString]) -> None:
             raise BaseError("Not a valid LangString")
         self._changed.add("comment")
 
-    def addComment(self, lang: Union[Languages, str], value: str) -> None:
-        self._comment[lang] = value
-        self._changed.add("comment")
-
-    def rmComment(self, lang: Union[Languages, str]) -> None:
-        del self._comment[lang]
-        self._changed.add("comment")
-
     @property
     def permissions(self) -> Optional[str]:
         return self._permissions
diff --git a/test/e2e/commands/project/test_propertyclass.py b/test/e2e/commands/project/test_propertyclass.py
index 120ed1fc2..f6ffc16dc 100644
--- a/test/e2e/commands/project/test_propertyclass.py
+++ b/test/e2e/commands/project/test_propertyclass.py
@@ -39,16 +39,8 @@ def test_PropertyClass_create() -> None:
     assert property_class.label["de"] == prop_label["de"]
     assert property_class.comment["de"] == prop_comment["de"]
 
-    # modify the property class
-    property_class.addLabel("en", "This is english comment")
-    property_class.rmLabel("de")
-    property_class.addComment("it", "Commentario italiano")
-    last_modification_date, property_class_updated = property_class.update(last_modification_date)
-    assert property_class_updated.label["en"] == "This is english comment"
-    property_class_updated.comment["it"] == "Commentario italiano"
-
     # delete the property class to clean up
-    _ = property_class_updated.delete(last_modification_date)
+    _ = property_class.delete(last_modification_date)
 
 
 if __name__ == "__main__":
diff --git a/test/e2e/commands/project/test_resourceclass.py b/test/e2e/commands/project/test_resourceclass.py
index 06ac79da0..81c051281 100644
--- a/test/e2e/commands/project/test_resourceclass.py
+++ b/test/e2e/commands/project/test_resourceclass.py
@@ -84,15 +84,6 @@ def test_ResourceClass_update(self) -> None:
 
         self.assertIsNotNone(res_class.iri)
 
-        # modify the resource class
-        res_class.addLabel("de", "Dies ist ein Kommentar")
-        res_class.rmLabel("en")
-        res_class.addComment("it", "Commentario italiano")
-
-        last_modification_date, res_class = res_class.update(last_modification_date)
-        self.assertEqual(res_class.label["de"], "Dies ist ein Kommentar")
-        self.assertEqual(res_class.comment["it"], "Commentario italiano")
-
 
 if __name__ == "__main__":
     pytest.main([__file__])