diff --git a/dsp_permissions_scripts/doap/doap_model.py b/dsp_permissions_scripts/doap/doap_model.py
index ce444ad..0e147c4 100644
--- a/dsp_permissions_scripts/doap/doap_model.py
+++ b/dsp_permissions_scripts/doap/doap_model.py
@@ -8,6 +8,8 @@
 
 from dsp_permissions_scripts.models.errors import EmptyDoapTargetError
 from dsp_permissions_scripts.models.errors import InvalidEntityDoapTargetError
+from dsp_permissions_scripts.models.errors import InvalidPrefixedPropError
+from dsp_permissions_scripts.models.errors import InvalidPrefixedResclassError
 from dsp_permissions_scripts.models.group import PREFIXED_IRI_REGEX
 from dsp_permissions_scripts.models.group import Group
 from dsp_permissions_scripts.models.scope import PermissionScope
@@ -82,16 +84,13 @@ def _validate(self) -> Self:
 
     @model_validator(mode="after")
     def _validate_name_format(self) -> Self:
-        if self.prefixed_class and any([x in self.prefixed_class for x in ["#", "/", "knora.org", "dasch.swiss"]]):
-            raise ValueError(f"The resource class name must not be a full IRI, but you provided {self.prefixed_class}")
-        if self.prefixed_class and not re.search(PREFIXED_IRI_REGEX, self.prefixed_class):
-            raise ValueError(
-                "The resource class name must be in the format 'onto:resclass_name', "
-                f"but you provided {self.prefixed_class}"
-            )
-        if self.prefixed_prop and any([x in self.prefixed_prop for x in ["#", "/", "knora.org", "dasch.swiss"]]):
-            raise ValueError(f"The property name must not be a full IRI, but you provided {self.prefixed_prop}")
-        if self.prefixed_prop and not re.search(PREFIXED_IRI_REGEX, self.prefixed_prop):
-            msg = f"The property name must be in the format 'onto:prop_name', but you provided {self.prefixed_prop}"
-            raise ValueError(msg)
+        def _fails(s: str) -> bool:
+            contains_forbidden = any(x in s for x in ["#", "/", "knora.org", "dasch.swiss"])
+            fails_regex = not re.search(PREFIXED_IRI_REGEX, s)
+            return contains_forbidden or fails_regex
+
+        if self.prefixed_class and _fails(self.prefixed_class):
+            raise InvalidPrefixedResclassError(self.prefixed_class)
+        if self.prefixed_prop and _fails(self.prefixed_prop):
+            raise InvalidPrefixedPropError(self.prefixed_prop)
         return self
diff --git a/dsp_permissions_scripts/models/errors.py b/dsp_permissions_scripts/models/errors.py
index d8f44a8..dcb2773 100644
--- a/dsp_permissions_scripts/models/errors.py
+++ b/dsp_permissions_scripts/models/errors.py
@@ -62,10 +62,30 @@ class EmptyDoapTargetError(Exception):
 class InvalidEntityDoapTargetError(Exception):
     message: str
 
-    def __init__(self, resclass_iri: str) -> None:
+    def __init__(self, invalid_resclass_iri: str) -> None:
         iri_formats = [
             "http://0.0.0.0:3333/ontology/<shortcode>/<ontoname>/v2#<classname_or_property_name>",
             "http://api.<subdomain>.dasch.swiss/ontology/<shortcode>/<ontoname>/v2#<classname_or_property_name>",
             "http://api.knora.org/ontology/knora-api/v2#<knora_base_class_or_base_property>",
         ]
-        self.message = f"The IRI must be in one of the formats {iri_formats}, but you provided {resclass_iri}"
+        self.message = f"The IRI must be in one of the formats {iri_formats}, but you provided {invalid_resclass_iri}"
+
+
+class InvalidPrefixedResclassError(Exception):
+    message: str
+
+    def __init__(self, invalid_prefixed_resclass: str) -> None:
+        self.message = (
+            f"The resource class name must be in the format 'onto:resclass_name', "
+            f"but you provided {invalid_prefixed_resclass}"
+        )
+
+
+class InvalidPrefixedPropError(Exception):
+    message: str
+
+    def __init__(self, invalid_prefixed_property: str) -> None:
+        self.message = (
+            f"The property name must be in the format 'onto:property_name', "
+            f"but you provided {invalid_prefixed_property}"
+        )