Background RFC as of Release 7.0, SP14
1. CALL FUNCTION func IN BACKGROUND UNIT
parameter_list.
Transactional RFC before Release 7.0, SP14
2. CALL FUNCTION func IN BACKGROUND TASK
[DESTINATION dest]
parameter_list
[AS SEPARATE UNIT].
Background RFC (bgRFC) is the enhanced successor technology for the transactional RFC (tRFC). Currently,
all variants can still be used. However, it is strongly recommended that you use the bgRFC instead of the tRFC.