diff --git a/tiramisu/api.py b/tiramisu/api.py
index 3f532e2..78034ae 100644
--- a/tiramisu/api.py
+++ b/tiramisu/api.py
@@ -427,15 +427,10 @@ class TiramisuOptionValue(CommonTiramisuOption):
         if isinstance(value, list):
             while undefined in value:
                 idx = value.index(undefined)
-                option_bag = OptionBag()
-                option_bag.set_option(self.option_bag.option,
-                                      self.option_bag.path,
-                                      idx,
-                                      self.option_bag.config_bag)
-                value[idx] = values.getdefaultvalue(option_bag)
-        else:
-            if value == undefined:
-                value = values.getdefaultvalue(self.option_bag)
+                value[idx] = values.getdefaultvalue(self.option_bag,
+                                                    force_index=idx)
+        elif value == undefined:
+            value = values.getdefaultvalue(self.option_bag)
         self.subconfig.setattr(value,
                                self.option_bag)
 
@@ -956,9 +951,8 @@ class TiramisuContextOption(TiramisuContext):
                     if type == 'option' or (type == 'optiondescription' and \
                             group_type and opt.impl_get_group_type() != group_type):
                         continue
-                else:
-                    if type == 'optiondescription':
-                        continue
+                elif type == 'optiondescription':
+                    continue
                 path = opt.impl_getpath()
                 subconfig, name = self.config_bag.context.cfgimpl_get_home_by_path(path,
                                                                                    self.config_bag)
diff --git a/tiramisu/value.py b/tiramisu/value.py
index ebee0f0..7aba2c4 100644
--- a/tiramisu/value.py
+++ b/tiramisu/value.py
@@ -16,6 +16,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 # ____________________________________________________________
 import weakref
+from typing import Optional
 from .error import ConfigError, PropertiesOptionError
 from .setting import owners, expires_time, undefined, forbidden_owners, OptionBag, ConfigBag
 from .autolib import carry_out_calculation
@@ -124,7 +125,8 @@ class Values(object):
         return self.getdefaultvalue(option_bag)
 
     def getdefaultvalue(self,
-                        option_bag):
+                        option_bag,
+                        force_index: Optional[int]=None):
         """get default value:
         - get meta config value or
         - get calculated value or
@@ -140,6 +142,8 @@ class Values(object):
         context = config_bag.context
         opt = option_bag.option
         index = option_bag.index
+        if force_index is not None:
+            index = force_index
         def _reset_cache(_value):
             if not 'expire' in option_bag.properties:
                 return
@@ -156,24 +160,11 @@ class Values(object):
             # calculated value is a new value, so reset cache
             context.cfgimpl_reset_cache(option_bag)
 
-        if opt.impl_is_master_slaves('slave'):
-            index_ = index
-        else:
-            index_ = None
-        if option_bag.index != index_:
-            moption_bag = OptionBag()
-            moption_bag.set_option(opt,
-                                   option_bag.path,
-                                   index_,
-                                   config_bag)
-            moption_bag.fromconsistency = option_bag.fromconsistency.copy()
-        else:
-            moption_bag = option_bag
-        if self._is_meta(moption_bag):
-            moption_bag.properties = frozenset()
+        if self._is_meta(option_bag):
+            option_bag.properties = frozenset()
             meta = context.cfgimpl_get_meta()
             # retrieved value from meta config
-            return meta.cfgimpl_get_values().get_cached_value(moption_bag)
+            return meta.cfgimpl_get_values().get_cached_value(option_bag)
 
         if opt.impl_has_callback():
             # if value has callback, calculate value
@@ -390,13 +381,13 @@ class Values(object):
                                       owners.default,
                                       index=option_bag.index)
         if owner is owners.default and validate_meta is not False and self._is_meta(option_bag):
-            moption_bag = option_bag.copy()
-            moption_bag.properties = frozenset()
-            config_bag = moption_bag.config_bag.copy()
+            option_bag = option_bag.copy()
+            option_bag.properties = frozenset()
+            config_bag = option_bag.config_bag.copy()
             meta = context.cfgimpl_get_meta()
             config_bag.context = meta
-            moption_bag.config_bag = config_bag
-            owner = meta.cfgimpl_get_values().getowner(moption_bag,
+            option_bag.config_bag = config_bag
+            owner = meta.cfgimpl_get_values().getowner(option_bag,
                                                        only_default=only_default)
         return owner