It is important for countries and educational institutions located outside of the European Higher Education Area to realize that Diploma Supplements cannot be retroactively issued, hence why students who graduated before their institution's country became signatory to the Bologna Convention cannot possibly have a diploma supplement for that degree.
For countries and educational institutions outside of the European Higher Education Area, it is vital to recognize that Diploma Supplements cannot be issued retrospectively. Therefore, graduates from institutions whose countries did not sign the Bologna Convention before their graduation do not qualify for a diploma supplement for their degrees.