Records are held in an ESDS in the order in which they were first loaded into the data set. New records added to an ESDS always go after the last record in the data set. You may not alter the length of a record and you may not delete a record via the RBA base. After a record has been stored in an ESDS, its RBA remains constant. When browsing, records are retrieved in the order in which they were added to the data set.
Deleting records in between will create imbedded space which is not allowed in the ESDS.