Hi Karisma,
you are trying to delete a record from Movie table that is referenced as foreign key in PersonMovieRole table.
That happens because the delete rule of that foreign key attribute is set to Protect. You would need to change the delete rule to Delete or Ignore to be able to delete that movie with the existing record in PersonMovieRole table.
Check this documentation page to understand how it works:
https://success.outsystems.com/Documentation/11/Developing_an_Application/Use_Data/Data_Modeling/Entity_Relationships/Delete_Rules
Regards