Hi,
its standard data source. So no need to change anything.As my guess existing delta may be corrupted.
Again do the reinit without data transfer and set delta pointer at info pack level.
Before doing reinit, you need to delete the old init at info pack, Menu Scheduler-->init options for source system.
After the successful of init, you can cross check at source side RSA7. Once material record was changed that entry will be captured at RSA7.
Thanks