Was there any border issue relating to Germany left over after 1990?

Address the question of the final determination of German borders (pending since the end of the Cold war) with the main question: was there aby border issue relating to Germany left over after 1990?For this, you will have to determine:What border issues were still openHow they were discussed (and where)How they were resolved Was there any issue left over?+And some other information that you consider necessary to answer the question