Answer Posted / jacky.jhan

reference from SAP Library
1.UPDATE
This statement allows you to change one or more lines in
the database table target

2.Modify
If the database table contains no line with the same
primary key as the line to be inserted, MODIFY works like
IINSERT - that is, the line is added.

If the database already contains a line with the same
primary key as the line to be inserted, MODIFY works like
UPDATE - that is, the line is changed.

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