SAP DATA OBJECTS USAGE WRITING documentation, setup help and example usage

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Writer Positions
In a writer position, the content of the operand is changed when the statement is executed. Only modifiable data objects (that is, no literals, text symbols, constants, or non-modifiable formal parameters) can be specified as follows in writer positions:

A visible data object specified at this place using a name dobj , a field symbol fs , or a dereferenced data reference dref- * (if dref is typed in full). Similar to reader positions

, [] can be appended for internal tables, to address the table body .

A subarea of a flat character-like or byte-like data object specified, using an offset/length . An offset or length cannot be specified in writer positions for data objects of the deep data types string and xstring

.

In a declaration position , an inline declaration of a data object or field symbol can be made using a declaration expression .

Writable expressions can be specified in a result position .

Writer-only positions, where an operand is overwritten without being read, and writer positions where an operand is read and written are both available.

Note
Certain expressions can also be specified in some writer positions.