PERFORM subr(prog)
Short Reference
ABAP Syntax(Obsolete) PERFORM subr(prog) [IF FOUND] [
parameter_list ].
What does it do? A variant of the external
subroutine call that is not allowed in classes. The statement
PERFORM calls the statically declared subroutine subr of a
program prog .
The existence of the specified program and subroutine is not check by
the syntax check. Only the
extended program check registers any nonexistent programs or
subroutines as errors by default. If the addition IF FOUND is
specified, the extended program check also skips the check.
If the specified subroutine or program does not exist at runtime, a
handleable exception of the class CX_SY_DYN_CALL_ILLEGAL_FORM or
CX_SY_PROGRAM_NOT_FOUND is raised by default. If the addition
IF FOUND is specified, the statement PERFORM is skipped.
Latest notes: In this variant, the program name prog is specified
directly in parentheses. Since parentheses in operand positions indicate
a dynamic specification in all other cases, this form of the name is
obsolete. Specify it with the addition IN
PROGRAM instead.
External calls of subroutines are obsolete in any case. Instead of
subroutines, methods and function modules can be used as explicit
functional interfaces of a program.
Furthermore, external calls of subroutines are critical, since it
cannot usually be statically determined to which
program groups the framework program is
assigned.
To call a subroutine in a program in a different package, the
declaration of the subroutine must be shared between a declaration part
and an implementation part using FORM -
DEFINITION, IMPLEMENTATION ; the declaration part must always be
public in the package interface.
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