diff --git a/meshroom/core/attribute.py b/meshroom/core/attribute.py
index 0c9bb563..2e6059ff 100644
--- a/meshroom/core/attribute.py
+++ b/meshroom/core/attribute.py
@@ -196,6 +196,7 @@ class Attribute(BaseObject):
             self.requestNodeUpdate()
 
         self.valueChanged.emit()
+        self.validValueChanged.emit()
 
     def upgradeValue(self, exportedValue):
         self._set_value(exportedValue)
diff --git a/meshroom/core/desc.py b/meshroom/core/desc.py
index 05d9478a..6d8cc2fa 100644
--- a/meshroom/core/desc.py
+++ b/meshroom/core/desc.py
@@ -303,13 +303,15 @@ class FloatParam(Param):
 class ChoiceParam(Param):
     """
     """
-    def __init__(self, name, label, description, value, values, exclusive, uid, group='allParams', joinChar=' ', advanced=False, semantic='', enabled=True):
+    def __init__(self, name, label, description, value, values, exclusive, uid, group='allParams', joinChar=' ', advanced=False, semantic='',
+                 enabled=True, validValue=True, errorMessage=""):
         assert values
         self._values = values
         self._exclusive = exclusive
         self._joinChar = joinChar
         self._valueType = type(self._values[0])  # cast to value type
-        super(ChoiceParam, self).__init__(name=name, label=label, description=description, value=value, uid=uid, group=group, advanced=advanced, semantic=semantic, enabled=enabled)
+        super(ChoiceParam, self).__init__(name=name, label=label, description=description, value=value, uid=uid, group=group, advanced=advanced,
+                                          semantic=semantic, enabled=enabled, validValue=validValue, errorMessage=errorMessage)
 
     def conformValue(self, val):
         """ Conform 'val' to the correct type and check for its validity """