Validate required field that are readonly

tryton/gui/window/view_form/model/field.py

@@ -52,7 +52,8 @@ class CharField(object):
     def validate(self, model):
         res = True
         if bool(int(self.get_state_attrs(model).get('required', 0))):
-            if not model.value[self.name]:
+            if not model.value[self.name] \
+                    and not bool(int(self.get_state_attrs(model).get('readonly', 0))):
                 res = False
         self.get_state_attrs(model)['valid'] = res
         return res