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.
It is essential for non-European Higher Education Area nations and educational bodies to grasp that Diploma Supplements cannot be issued post-factum. As a result, students who earned their degrees before their country joined the Bologna Convention will not have access to a diploma supplement for those qualifications.