diff --git a/cads_adaptors/exceptions.py b/cads_adaptors/exceptions.py
index 25be5e40..5cf2cb67 100644
--- a/cads_adaptors/exceptions.py
+++ b/cads_adaptors/exceptions.py
@@ -12,25 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from copy import deepcopy
-
 
 class ParameterError(TypeError):
     """Raised when a request parameter is invalid."""
 
 
-class InvalidRequest(Exception):
+class InvalidRequest(ValueError):
     """Raised when an invalid request is sent to the adaptor."""
 
-    def __init__(self, msgs: None | str | list[str] = None):
-        if isinstance(msgs, str):
-            msgs = [msgs]
-
-        if msgs is not None:
-            super().__init__("\n".join(msgs))
-
-            self.messages = deepcopy(msgs)
-
 
 class MarsRuntimeError(RuntimeError):
     """Raised when a MARS request fails."""
diff --git a/cads_adaptors/validation/enforce.py b/cads_adaptors/validation/enforce.py
index 413057bb..8458eaf4 100644
--- a/cads_adaptors/validation/enforce.py
+++ b/cads_adaptors/validation/enforce.py
@@ -87,7 +87,8 @@ def enforce(
         for msg in [error_message(e) for e in errors]:
             if msg not in msgs:
                 msgs.append(msg)
-        raise cads_adaptors.exceptions.InvalidRequest(msgs)
+        error_msg = "\n".join(msgs)
+        raise cads_adaptors.exceptions.InvalidRequest(error_msg)
 
     return request