Calls or registers subroutines.
Subroutines can be called statically and dynamically, internally and externally. Parameters can only be passed if they are called statically. Furthermore, subroutines can be registered for execution at the end of an SAP LUW.
Subroutines are obsolete. Do not create new subroutines in new programs. Methods should be used instead. Subroutines created in existing programs for internal modularization can continue to be called. Whenever possible, however, external subroutine calls from other programs should be avoided.