ORA-64780
Section 1 of multi-section backup set string of data file string has not reached this Recovery Appliance.
Cause
Section 1 of the multi-section backup did not reach the Recovery Appliance. Without the section, INDEX_BACKUP tasks of other sections of the backup set remain in ORDERING_WAIT state.
Action
This could be temporary because sections of a multi-section backup do not reach the Recovery Appliance in order. If the problem persists, check the status of the incoming backup, as well as status of INDEX_BACKUP tasks for this database.