diff --git a/lib/factories.js b/lib/factories.js
index 475386c57c..50741c06fd 100644
--- a/lib/factories.js
+++ b/lib/factories.js
@@ -588,6 +588,21 @@ var objectVisitor = function (self, schema, data, callback) {
 };
 
 
+function check_options_correctness_against_schema(schema, options) {
+   // check correctness of option fields
+    var possible_fields = schema.fields.map(function (field) {
+        return field.name;
+    });
+    var current_fields = Object.keys(options);
+    var invalid_options_fields = _.difference(current_fields, possible_fields);
+    if (invalid_options_fields.length > 0) {
+        var err = new Error();
+        console.log("expected schema", schema.name);
+        require("./utils").display_trace_from_this_projet_only();
+        console.log("invalid_options_fields= ", invalid_options_fields);
+    }
+    assert(invalid_options_fields.length === 0 && " invalid field found in option");
+}
 /**
  * base constructor for all OPC-UA Object
  *
@@ -611,18 +626,7 @@ function BaseObject(schema,options) {
     };
 
     options = options || {};
-
-    // check correctness of option fields
-    var possible_fields = schema.fields.map(function(field){return field.name;});
-    var current_fields = Object.keys(options);
-    var invalid_options_fields =_.difference(current_fields,possible_fields);
-    if(invalid_options_fields.length>0) {
-        var err = new Error();
-        console.log("expected schema" ,schema.name );
-        require("./utils").display_trace_from_this_projet_only();
-        console.log("invalid_options_fields= ",invalid_options_fields);
-    }
-    assert( invalid_options_fields.length === 0 && " invalid field found in option");
+    check_options_correctness_against_schema(schema, options);
 
     var data = {
         options: options,