diff --git a/tiramisu/autolib.py b/tiramisu/autolib.py
index c5f7fd3..f22f208 100644
--- a/tiramisu/autolib.py
+++ b/tiramisu/autolib.py
@@ -21,7 +21,7 @@
 from typing import Any, Optional, Union, Callable, Dict, List
 from itertools import chain
 
-from .error import PropertiesOptionError, ConfigError, LeadershipError
+from .error import PropertiesOptionError, ConfigError, LeadershipError, ValueWarning
 from .i18n import _
 from .setting import undefined, ConfigBag, OptionBag, Undefined
 from .storage import get_default_values_storages, get_default_settings_storages
@@ -60,7 +60,6 @@ class Param:
 
 class ParamOption(Param):
     __slots__ = ('todict',
-                 'error',
                  'option',
                  'notraisepropertyerror',
                  'raisepropertyerror')
@@ -116,7 +115,7 @@ class Calculation:
     __slots__ = ('function',
                  'params',
                  'help_function',
-                 'has_index',
+                 '_has_index',
                  'warnings_only')
     def __init__(self,
                  function: Callable,
@@ -133,10 +132,8 @@ class Calculation:
         self.params = params
         for arg in chain(self.params.args, self.params.kwargs.values()):
             if isinstance(arg, ParamIndex):
-                self.has_index = True
+                self._has_index = True
                 break
-        else:
-            self.has_index = False
         if warnings_only is True:
             self.warnings_only = warnings_only
 
@@ -167,6 +164,17 @@ class Calculation:
                                      config_bag=option_bag.config_bag,
                                      leadership_must_have_index=leadership_must_have_index)
 
+    def has_index(self, current_option):
+        if hasattr(self, '_has_index'):
+            return self._has_index
+        self._has_index = False
+        for arg in chain(self.params.args, self.params.kwargs.values()):
+            if isinstance(arg, ParamOption) and arg.option.impl_get_leadership() and \
+                    arg.option.impl_get_leadership().in_same_group(current_option):
+                self._has_index = True
+                break
+        return self._has_index
+
 
 class Break(Exception):
     pass
@@ -326,10 +334,12 @@ def carry_out_calculation(option,
     - tuple with option and boolean's force_permissive (True when don't raise
     if PropertiesOptionError)
     Values could have multiple values only when key is ''."""
+    def fake_items(iterator):
+        return ((None, i) for i in iterator)
     args = []
     kwargs = {}
     if callback_params:
-        for callbk in callback_params.args:
+        for key, callbk in chain(fake_items(callback_params.args), callback_params.kwargs.items()):
             try:
                 value = manager_callback(callbk,
                                          option,
@@ -339,30 +349,18 @@ def carry_out_calculation(option,
                                          leadership_must_have_index)
                 if value is undefined:
                     return undefined
-                args.append(value)
+                if key is None:
+                    args.append(value)
+                else:
+                    kwargs[key] = value
             except PropertiesOptionError as err:
                 if callbk.raisepropertyerror:
                     raise err
                 if callbk.todict:
-                    args.append({'propertyerror': str(err)})
-            except Break:
-                continue
-        for key, callbk in callback_params.kwargs.items():
-            try:
-                value = manager_callback(callbk,
-                                         option,
-                                         index,
-                                         orig_value,
-                                         config_bag,
-                                         leadership_must_have_index)
-                if value is undefined:
-                    return undefined
-                kwargs[key] = value
-            except PropertiesOptionError as err:
-                if callbk.raisepropertyerror:
-                    raise err
-                if callbk.todict:
-                    kwargs[key] = {'propertyerror': str(err)}
+                    if key is None:
+                        args.append({'propertyerror': str(err)})
+                    else:
+                        kwargs[key] = {'propertyerror': str(err)}
             except Break:
                 continue
     ret = calculate(option,
@@ -408,9 +406,11 @@ def calculate(option,
         if allow_raises:
             raise err
         error = err
+    except ValueWarning as err:
+        raise err
     except Exception as err:
-        #import traceback
-        #traceback.print_exc()
+        # import traceback
+        # traceback.print_exc()
         error = err
     if args or kwargs:
         msg = _('unexpected error "{0}" in function "{1}" with arguments "{3}" and "{4}" '