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ABENOO_OBS_LOOP_1 - OO OBS LOOP 1

Cannot Change an Internal Table in a Loop

You cannot change a complete internal table in a loop operating on this table in ABAP Objects. Changes to the table as a whole may be caused by, for example, the REFRESH, CLEAR, FREE, MOVE, SORT, or SELECT INTO TABLE statements. This applies to internal tables from procedures and internal tables imported from a data cluster.

In ABAP Objects, the following statements cause an error message:

LOOP AT itab INTO wa.
  CLEAR itab.
ENDLOOP.

Correct syntax:

LOOP AT itab INTO wa.
  ...
ENDLOOP.
CLEAR itab.

Cause:

When the table is accessed again, system behavior will be unpredictable and may lead to runtime errors.