SAP CALL PROCEDURES EXTERN documentation, setup help and example usage

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External Procedure Call
The following procedures of the same AS ABAP can be called externally:

Procedures which are intended for external calls:

Methods of global classes in class pools visible where called (that is, public methods in all programs), protected methods in subclasses, and private methods in

friends of the classes.

Function modules in function groups

Methods of local classes of other programs that are visible at the call position if a reference variable with a reference to an object of the class was passed to the calling program

Procedures which are not intended for external calls but can still be called externally (but should not be):

Subprograms in executable programs

module pools , function groups, and subroutine pools

Static methods of local classes which are visible at the call position, if the name of the class is specified dynamically using an absolute type name

During the first external call of a procedure of the same AS ABAP , its frame program is loaded in the internal session of the calling program if it has not yet been loaded. Except when loading class pools , the
LOAD-OF-PROGRAM event is also triggered, which calls the program constructor program. The external call of subprograms and methods of local classes is not recommended and is critical, since the assignment of the loaded frame program to a program group is usually not determined:

Program Groups in External Procedure Calls

Furthermore, for external procedure calls, the possibility that properties of the calling and called programs may differ must be con
sidered.

Program Attributes for External Procedure Call

ABAP_PGL Only call suitable procedures externally