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ABAP Keyword Documentation → ABAP − Reference → Processing Internal Data → Internal Tables → Expressions and Functions for Internal Tables → table_exp - Table Expressions →table_exp - Writer Positions
Table expressions and their chainings can be specified as writable expressions in result positions. The result of a table expression in these positions is always a temporary field symbol.
In the case of writes performed on the temporary field symbol, the same rules apply as to a field symbol assigned a table row using READ TABLE ASSIGNING. More specifically, the read-only character of key fields must be respected.
Note
The constructor operators VALUE and REF used to control the result of the table expression cannot be used in writer positions.
Example
See Table Expressions, Writer Position.