diff --git a/src/ft.h b/src/ft.h
index 0344af1..deacf1f 100644
--- a/src/ft.h
+++ b/src/ft.h
@@ -56,10 +56,11 @@ public:
 		no_insertable = 8,
 		no_updatable = 16,
 		no_fetchable = 32, /* not supported yet */
-		raw_field_name = 64,
-		dont_use_utf8 = 128,
-		hexadecimal =  256,
-		binary = 512,
+		no_removable = 64,
+		raw_field_name = 128,
+		dont_use_utf8 = 256,
+		hexadecimal =  512,
+		binary = 1024,
 	};
 
 	/*
@@ -122,18 +123,20 @@ public:
 		return !is_flag_set(no_insertable);
 	}
 
-
 	bool is_updatable() const
 	{
 		return !is_flag_set(no_updatable);
 	}
 
-
 	bool is_fetchable() const
 	{
 		return !is_flag_set(no_fetchable);
 	}
 
+	bool is_removable() const
+	{
+		return !is_flag_set(no_removable);
+	}
 
 	bool is_raw_field_name() const
 	{
diff --git a/src/model.cpp b/src/model.cpp
index 1739b89..8ba5ab5 100644
--- a/src/model.cpp
+++ b/src/model.cpp
@@ -1258,26 +1258,34 @@ void Model::field_model_set_parent_key(const wchar_t * db_field_name, Model & fi
 }
 
 
-void Model::field_model_iterate_through_childs(const wchar_t * db_field_name, Model & field_model)
+void Model::field_model_iterate_through_childs(const wchar_t * db_field_name, Model & field_model, const FT & field_type)
 {
 	if( model_env->model_work_submode == MORM_MODEL_WORK_SUBMODE_INSERT )
 	{
-		field_model.insert_tree(true);
+		if( field_type.is_insertable() )
+			field_model.insert_tree(true);
 	}
 
 	if( model_env->model_work_submode == MORM_MODEL_WORK_SUBMODE_UPDATE )
 	{
-		field_model.update_tree(true);
+		if( field_type.is_updatable() )
+			field_model.update_tree(true);
 	}
 
 	if( model_env->model_work_submode == MORM_MODEL_WORK_SUBMODE_REMOVE )
 	{
-		field_model.remove_tree(true);
+		if( field_type.is_removable() )
+			field_model.remove_tree(true);
 	}
 
 	if( model_env->model_work_submode == MORM_MODEL_WORK_SUBMODE_SAVE )
 	{
-		field_model.save_tree(true);
+		if( (field_model.save_mode == Model::DO_INSERT_ON_SAVE && field_type.is_insertable()) ||
+			(field_model.save_mode == Model::DO_UPDATE_ON_SAVE && field_type.is_updatable()) ||
+			(field_model.save_mode == Model::DO_DELETE_ON_SAVE && field_type.is_removable()) )
+		{
+			field_model.save_tree(true);
+		}
 	}
 }
 
@@ -1483,7 +1491,7 @@ void Model::field_model_for_db(const wchar_t * db_field_name, Model & field_mode
 	{
 		if( field_type.is_foreign_key() )
 		{
-			field_model_iterate_through_childs(db_field_name, field_model);
+			field_model_iterate_through_childs(db_field_name, field_model, field_type);
 		}
 	}
 
@@ -1491,7 +1499,7 @@ void Model::field_model_for_db(const wchar_t * db_field_name, Model & field_mode
 	{
 		if( field_type.is_foreign_key_in_child() )
 		{
-			field_model_iterate_through_childs(db_field_name, field_model);
+			field_model_iterate_through_childs(db_field_name, field_model, field_type);
 		}
 	}
 
diff --git a/src/model.h b/src/model.h
index f3f93e3..c7596b9 100644
--- a/src/model.h
+++ b/src/model.h
@@ -643,7 +643,7 @@ protected:
 	void field_model_save_key(const wchar_t * db_field_name);
 	void field_model_set_parent_key_in_child(const wchar_t * db_field_name, Model & field_model);
 	void field_model_set_parent_key(const wchar_t * db_field_name, Model & field_model);
-	void field_model_iterate_through_childs(const wchar_t * db_field_name, Model & field_model);
+	void field_model_iterate_through_childs(const wchar_t * db_field_name, Model & field_model, const FT & field_type);
 	void field_model_generate_flat_string(const wchar_t * flat_field_name, Model & field_model, const FT & field_type);
 	void field_model_generate_db_sql(const wchar_t * db_field_name, Model & field_model, const FT & field_type);
 	void field_model_clear_values(Model & field_model);