ABAP Keyword Documentation → ABAP Glossary
down cast
Also called narrowing cast. Assignment between
reference variables, where the
static type of the target
variable is more specific than the static type of the source variable and the assignability is checked at runtime. A down cast must always be performed explicitly. Assignments can be made using the
casting operator
(?=) and
constructor expressions
can be specified using the casting operator
CAST. Down casts are also still possible using the INTO addition
of the statement WHEN
TYPE of a case distinction using CASE TYPE OF. See also
up cast.