Enumeration used for indicating the direction of a RFC function parameter.
Syntax
typedef enum _RFC_DIRECTION
{
RFC_IN = 0x0001, /* input parameter, corresponding to ABAP IMPORTING parameter */
RFC_OUT= 0x0002, /* output parameter, corresponding to ABAP EXPORTING parameter */
RFC_INOUT = RFC_IN | RFC_OUT /* input and output parameters, this is corresponding to ABAP
CHANGING or TABLES parameter */
}RFC_DIRECTION;