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ABENITAB_KEY_DUPLICATES - ITAB KEY DUPLICATES

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- Duplicate Unique Keys

When lines are inserted into internal tables with a unique primary key or unique secondary key, duplicates can occur with respect to one or more of these keys. Depending on whether the insertion is a single record operation or a mass operation, the ABAP runtime framework reacts as follows to an attempt to insert an entry with duplicate key values:

• First, it checks whether duplicate key values would occur with respect to the primary key. The system behavior is as follows depending on the operation:

• When single lines are inserted using the variant

INSERT wa INTO TABLE itab

duplicate entries with respect to the primary key are ignored and sy-subrc is set to 4. This is often used to filter out duplicates when the table is constructed.

• In all other cases, such as

INSERT ... INTO itab INDEX idx
INSERT LINES OF (bulk operation)
APPEND
COLLECT
=, IMPORT (bulk operations)

the runtime error ITAB_DUPLICATE_KEY occurs.

• A check is then made to see whether duplicate key values would occur with respect to any existing unique secondary keys. If this is the case,

• an exception of the class CX_SY_ITAB_DUPLICATE_KEY is raised for the statements INSERT and APPEND if the operation is a single record operation.

• For all other insert and assignment operations, particularly for all mass operations, the runtime error ITAB_DUPLICATE_KEY occurs.

The first INSERT statement does not insert a line and sets sy-subrc to the value 4. The second INSERT statement produces a runtime error.

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