diff --git a/src/rougail/cli/__main__.py b/src/rougail/cli/__main__.py
index b64b9fd..2d87ac4 100644
--- a/src/rougail/cli/__main__.py
+++ b/src/rougail/cli/__main__.py
@@ -164,7 +164,8 @@ def load_user_datas(rougailconfig):
         user_data_names = rougailconfig["step.user_data"]
     except PropertiesOptionError:
         user_data_names = []
-    if rougailconfig["cli.layers"]:
+    has_layers = rougailconfig["cli.layers"]
+    if has_layers:
         layers = [[ud] for ud in user_data_names]
         last_layers = len(layers) - 1
     else:
@@ -172,8 +173,8 @@ def load_user_datas(rougailconfig):
         last_layers = 0
     rougail = Rougail(rougailconfig)
     layer_name = "_".join(layers[-1])
-    config = rougail.run(name=layer_name)
-    metaconfig = config
+    subconfig = rougail.run(name=layer_name)
+    metaconfig = subconfig
     if last_layers:
         for layer in layers[:-1]:
             layer_name = "_".join(layer)
@@ -181,11 +182,13 @@ def load_user_datas(rougailconfig):
             metaconfig.owner.set(metaconfig.path())
     subconfig = metaconfig
     err_warn = {"errors": [], "warnings": []}
+    invalid_user_datas_error = rougailconfig["cli.invalid_user_datas_error"]
+    unknown_user_datas_error = rougailconfig["cli.unknown_user_datas_error"]
+    interactive_user_datas = {}
     for idx, layer in enumerate(layers):
         if idx:
             subconfig = subconfig.config("_".join(layer))
-        config.owner.set(subconfig.path())
-        subconfig.property.read_write()
+            subconfig.owner.set(subconfig.path())
         # data user
         user_datas = []
         for user_data_name in layer:
@@ -199,22 +202,33 @@ def load_user_datas(rougailconfig):
                     _('cannot find "user_data" module "{0}"').format(user_data_name)
                 )
             module = load_modules("rougail.user_data_" + user_data_name, str(path))
+            rougail_user_datas = module.RougailUserData
+            if hasattr(rougail_user_datas, 'interactive_user_datas') and rougail_user_datas.interactive_user_datas:
+                interactive_user_datas[user_data_name] = rougail_user_datas
+                continue
+            elif interactive_user_datas:
+                raise Exception(_(f'interactive user datas "{0}" is loader before uninteractive user datas "{1}"').format(list(interactive_user_datas), user_data_name))
             user_datas.extend(
-                module.RougailUserData(
+                rougail_user_datas(
                     subconfig,
                     rougailconfig=rougailconfig,
                 ).run()
             )
-            if user_datas:
-                new_err_warn = UserDatas(subconfig).user_datas(user_datas)
-                for level, datas in new_err_warn.items():
-                    if datas:
-                        err_warn[level].updates(datas)
-    subconfig = metaconfig
-    for idx, layer in enumerate(layers):
-        if idx:
+        if user_datas:
+            new_err_warn = UserDatas(subconfig).user_datas(user_datas, invalid_user_datas_error=invalid_user_datas_error, unknown_user_datas_error=unknown_user_datas_error)
+            for level, datas in new_err_warn.items():
+                if datas:
+                    err_warn[level].updates(datas)
+    for layer, rougail_user_datas in interactive_user_datas.items():
+        if has_layers and len(layers) > 1:
             subconfig = subconfig.config("_".join(layer))
-    return metaconfig, config, err_warn
+            subconfig.owner.set(subconfig.path())
+        rougail_user_datas(
+            subconfig,
+            rougailconfig=rougailconfig,
+        ).run()
+
+    return metaconfig, subconfig, err_warn
 
 
 def get_output(rougailconfig, metaconfig, config, err_warn):
diff --git a/src/rougail/cli/config.py b/src/rougail/cli/config.py
index c8729b8..ae556e2 100644
--- a/src/rougail/cli/config.py
+++ b/src/rougail/cli/config.py
@@ -41,6 +41,10 @@ cli:
 
   versions: false  # {_('Displays Rougail version and all its components')}
 
+  invalid_user_datas_error: false  # {_("Invalid value in user datas is not allowed")}
+
+  unknown_user_datas_error: false  # {_("Unknown variable in user datas is not allowed")}
+
   layers:
     description: {_('Open each user datas in separate layers')}
     default: false