I have migrated from 7.3.4.5 to 8.1.7.3. But one of the packages is invalid and it gave PLS-00907 error(cannot load library unit).
This package will access remote database which is 7.3.4.5. Can anyone have any idea what should I do for avoiding this error.
I tried
alter system set remote_dependencies_mode='SIGNATURE';
on newly migrated database.
but it didn't work.