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Deep Dives
Modern ABAP
Flow control

Loop with control break

Process data on defined groups using the new features with the loop statement extension group by ... and loop at group.

LOOP AT accounts INTO DATA(account) GROUP BY grouping_id.
  " once per group before group ...
  LOOP AT GROUP account INTO DATA(account_group).
    " for each group member ...
  ENDLOOP.
  " once per group after group ...
ENDLOOP.

Old style:

DATA previous_grouping_id TYPE i.
DATA last_account TYPE account.
LOOP AT accounts INTO data(account).
  IF account-grouping_id <> previous_grouping_id.
    previous_grouping_id = account-grouping_id
    " once per group before group ...
    IF last_account IS NOT INITIAL.
      " once per group after group ...
    ENDIF.
  ENDIF.
  " for each group member ...
  last_account = account.
ENDLOOP.
IF last_account IS NOT INITIAL.
  " once per group after group
ENDIF.
From SAP/styleguides under CC BY 3.0 — more details
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