How to programmatically tell if system is R/3 or S/4 - abap

Question

Is it possible to determine via code if the current system is R/3 or S/4?
I need it because I have a method that returns the software component of Human Resources related data, but this component should be different to R/3 and S/4 systems.
DATA(lv_software_component) = mo_configuration->get_software_component( ).
SELECT * FROM tadir INTO TABLE #DATA(lt_inftype_tables)
WHERE pgmid = 'R3TR'
AND object = 'TABL'
AND devclass IN ( SELECT devclass FROM tdevc
WHERE dlvunit = #lv_software_component
OR dlvunit = 'SAP_HRGXX'
OR dlvunit = 'SAP_HRRXX' )
On R/3, lv_software_component should be 'SAP_HRCMX', for example, while on S/4 it should be 'S4HCMCMX'. Currently, I have no idea on how to tell the difference between the releases, programmatically speaking.
The best I've come up with is hardcoding SY-SYSID, since I know which systems are S/4 and which aren't, but that shouldn't be ideal.
I appreciate any help, thanks!

Answer 1

You can use below class method for determining it. On the other hand is_s4h method only exists on S4 system. You need to check method exits before calling it.
cl_cos_utilities=>is_s4h( )
Working full example:
REPORT ZMKY_ISS4.
CLASS cl_oo_include_naming DEFINITION LOAD.
DATA oref TYPE REF TO if_oo_class_incl_naming.
DATA: lt_methods TYPE seop_methods_w_include,
lv_clskey TYPE seoclskey,
ls_cpdkey TYPE seocpdkey,
lv_iss4 TYPE abap_bool,
lt_params TYPE abap_parmbind_tab.
lv_clskey = 'CL_COS_UTILITIES'.
oref ?= cl_oo_include_naming=>get_instance_by_cifkey( lv_clskey ).
lt_methods = oref->get_all_method_includes( ).
ls_cpdkey-clsname = lv_clskey.
ls_cpdkey-cpdname = 'IS_S4H'.
READ TABLE lt_methods WITH KEY cpdkey = ls_cpdkey TRANSPORTING NO FIELDS.
IF sy-subrc EQ 0.
lt_params = VALUE #( ( name = 'RV_IS_S4H'
kind = cl_abap_objectdescr=>returning
value = REF #( lv_iss4 ) ) ).
CALL METHOD CL_COS_UTILITIES=>('IS_S4H')
PARAMETER-TABLE
lt_params.
ELSE.
lv_iss4 = abap_false.
ENDIF.

Answer 2

Using the method cl_cos_utilities=>is_s4h is a rather unclean solution, because that method does not exist on older releases.
A cleaner method is to use the function module SFW_IS_BFUNC_SWITCHED_ON. This function module checks if a business function in the switch framework is enabled.
To check for the S4HANA on premise business function:
CALL FUNCTION 'SFW_IS_BFUNC_SWITCHED_ON'
EXPORTING
bfunc_name = 'SIMPLIFY_ON_PREMISE'
IMPORTING
is_switched_on = is_s4.
To check for the S4HANA on cloud business function:
CALL FUNCTION 'SFW_IS_BFUNC_SWITCHED_ON'
EXPORTING
bfunc_name = 'SIMPLIFY_PUBLIC_CLOUD'
IMPORTING
is_switched_on = is_s4.
By the way: The method cl_cos_utilities=>is_s4h actually uses this function module internally.
You might also want to check if it might be more appropriate in your use-case to use that function module to actually detect which HR business functions are active instead of deriving that information indirectly from whether or not the system has S/4 activated.

Answer 3

There's the function module OCS_GET_INSTALLED_COMPS which returns all software components installed. Note that it's not released by SAP. It used to work in old systems and still works in S/4HANA.

Answer 4

You can use function module DELIVERY_CHCK_ACTIVE_COMPONENT to check which of the two components is active.
I am also pretty sure only S/4 systems will have the S4CORE component active if you really need to check if it's S/4 or R/3.