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Conversion takes place when converting the contents of a
screen field from display format to SAP-internal format and
vice versa and when outputting with the ABAP statement
WRITE, depending on the data type of the field.
If standard conversion is not suitable, it can be
overridden by specifying a conversion routine in the
underlying domain.
A conversion routine is identified by its five-place name
and is stored as a group of two function modules.
The function modules have a fixed naming convention.
The following function modules are assigned to conversion
routine xxxxx:
CONVERSION_EXIT_xxxxx_INPUT
CONVERSION_EXIT_xxxxx_OUTPUT
The INPUT module performs the conversion from display
format to internal format. The OUTPUT module performs
the conversion from internal format to display format.
If a screen field refers to a domain with a conversion
routine, this conversion routine is executed automatically
each time an entry is made in this screen field or when
values are displayed with this screen field.
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