diff --git a/src/Mod/Assembly/App/opendcm/core/defines.hpp b/src/Mod/Assembly/App/opendcm/core/defines.hpp
new file mode 100644
index 000000000..b6547533b
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+++ b/src/Mod/Assembly/App/opendcm/core/defines.hpp
@@ -0,0 +1,41 @@
+/*
+    openDCM, dimensional constraint manager
+    Copyright (C) 2013  Stefan Troeger <stefantroeger@gmx.net>
+
+    This library is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 2.1 of the License, or
+    (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License along
+    with this library; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef GCM_DEFINES_CORE_H
+#define GCM_DEFINES_CORE_H
+
+
+#include <boost/exception/exception.hpp>
+#include <string>
+
+namespace dcm {
+  
+//all solving related errors
+typedef boost::error_info<struct user_message,std::string> error_message;
+typedef boost::error_info<struct first_geom, std::string> error_type_first_geometry;
+typedef boost::error_info<struct second_geom, std::string> error_type_second_geometry;
+
+//exception codes are needed by the user
+struct creation_error : virtual boost::exception {};
+struct solving_error : virtual boost::exception {};
+struct constraint_error : virtual boost::exception {};
+
+} //dcm
+
+#endif //GCM_DEFINES_CORE_H
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