Prefer Modern Class-Based APIs over Obsolete Function Modules

WarningClean ABAP & Modern Syntax#EC PREF_FUNC_MODRemote Enabled

Overview

Prefer class-based APIs over obsolete function modules.

ATC Finding Message: Legacy function &1 is obsolete; migrate to &2

Rationale

Classic function modules are non-object-oriented procedural constructs. Modern ABAP provides robust, object-oriented class libraries (such as CL_SYSTEM_UUID, CL_ABAP_TSTMP, CL_ABAP_MESSAGE_DIGEST, and CL_BCS) that improve testability, type safety, and ABAP Cloud compatibility. Prefer recommended class-based APIs over obsolete function modules.

Non-Compliant

CALL FUNCTION 'GUID_CREATE'
  IMPORTING
    ev_guid_32 = lv_guid.

Compliant

lv_guid = cl_system_uuid=>create_uuid_c32_static( ).

Suppression

To suppress findings for this rule, append the pseudo-comment to the statement:

" Standard pseudo-comment:
... "#EC PREF_FUNC_MOD

" SAP CI_ prefix format:
... "#EC CI_PREF_FUNC_MOD

Recommended Replacements Reference

The following table lists all 67 obsolete classic function modules detected by this rule along with their recommended modern replacements:

Obsolete Function Module	Modern Recommended Replacement
CALCULATE_HASH_FOR_CHAR	CL_ABAP_MESSAGE_DIGEST
CALCULATE_HASH_FOR_RAW	CL_ABAP_HMAC or CL_ABAP_MESSAGE_DIGEST
CCU_TIMESTAMP_DIFFERENCE	CL_ABAP_TSTMP
CLPB_EXPORT	CL_GUI_FRONTEND_SERVICES
CLPB_IMPORT	CL_GUI_FRONTEND_SERVICES
CONVERT_DATE_TO_EXTERNAL	CL_ABAP_DATFM
CONVERT_TIME_INPUT	CL_ABAP_TIMEFM
DOWNLOAD	CL_GUI_FRONTEND_SERVICES
ECATT_CONV_XSTRING_TO_STRING	CL_BINARY_CONVERT
F4_FILENAME	CL_GUI_FRONTEND_SERVICES
FUNCTION_EXISTS	TRY..CATCH cx_sy_dyn_call_illegal_func
GUI_CREATE_DIRECTORY	CL_GUI_FRONTEND_SERVICES
GUI_DELETE_FILE	CL_GUI_FRONTEND_SERVICES
GUI_DOWNLOAD	CL_GUI_FRONTEND_SERVICES
GUI_EXEC	CL_GUI_FRONTEND_SERVICES
GUI_FB_USAGE	CL_GUI_FRONTEND_SERVICES
GUI_FILE_LOAD_DIALOG	CL_GUI_FRONTEND_SERVICES
GUI_FILE_SAVE_DIALOG	CL_GUI_FRONTEND_SERVICES
GUI_GET_DESKTOP_INFO	CL_GUI_FRONTEND_SERVICES
GUI_GET_FILE_INFO	CL_GUI_FRONTEND_SERVICES
GUI_GET_REGVALUE	CL_GUI_FRONTEND_SERVICES
GUI_MULTIPLE_FILE_LOAD_DIALOG	CL_GUI_FRONTEND_SERVICES
GUI_REMOVE_DIRECTORY	CL_GUI_FRONTEND_SERVICES
GUI_RUN	CL_GUI_FRONTEND_SERVICES
GUI_SET_REGVALUE	CL_GUI_FRONTEND_SERVICES
GUI_UPLOAD	CL_GUI_FRONTEND_SERVICES
GUI_VSS_DOWNLOAD	CL_GUI_FRONTEND_SERVICES
GUI_VSS_UPLOAD	CL_GUI_FRONTEND_SERVICES
GUID_CREATE	CL_SYSTEM_UUID
IGN_TIMESTAMP_DIFFERENCE	CL_ABAP_TSTMP
IGN_TIMESTAMP_PLUSMINUS	CL_ABAP_TSTMP
ISM_SD_GET_PRICING_CONDITIONS	CL_PRC_RESULT_FACTORY (SAP Note 2220005)
JOB_CREATE	CL_BP_ABAP_JOB
JOB_SUBMIT	CL_BP_ABAP_JOB
MD5_CALCULATE_HASH_FOR_CHAR	CL_ABAP_MESSAGE_DIGEST
MD5_CALCULATE_HASH_FOR_RAW	CL_ABAP_MESSAGE_DIGEST
POPUP_TO_CONFIRM_LOSS_OF_DATA	POPUP_TO_CONFIRM
POPUP_TO_CONFIRM_STEP	POPUP_TO_CONFIRM
POPUP_TO_CONFIRM_WITH_MESSAGE	POPUP_TO_CONFIRM
POPUP_TO_CONFIRM_WITH_VALUE	POPUP_TO_CONFIRM
POPUP_TO_CONFIRM_WITH_VALUE_2	POPUP_TO_CONFIRM
POPUP_TO_DECIDE	POPUP_TO_CONFIRM
POPUP_TO_DECIDE_INFO	POPUP_TO_CONFIRM
POPUP_TO_DECIDE_WITH_MESSAGE	POPUP_TO_CONFIRM
POPUP_TO_GET_VALUE	POPUP_GET_VALUES
QF05_RANDOM_INTEGER	CL_ABAP_RANDOM_INT
REGISTRY_GET	CL_GUI_FRONTEND_SERVICES
REGISTRY_SET	CL_GUI_FRONTEND_SERVICES
REUSE_ALV_GRID_DISPLAY	CL_SALV_TABLE=>FACTORY or CL_GUI_ALV_GRID
ROUND	built-in function round( )
SAPGUI_PROGRESS_INDICATOR	CL_PROGRESS_INDICATOR
SCMS_BASE64_DECODE_STR	CL_HTTP_UTILITY
SCMS_STRING_TO_XSTRING	CL_BINARY_CONVERT
SO_NEW_DOCUMENT_ATT_SEND_API1	CL_BCS
SSFC_BASE64_DECODE	CL_HTTP_UTILITY
SSFC_BASE64_ENCODE	CL_HTTP_UTILITY
SUBST_GET_FILE_LIST	SAP Note 1686357
SYSTEM_GET_UNIQUE_ID	CL_SYSTEM_UUID
SYSTEM_UUID_C_CREATE	CL_SYSTEM_UUID
UPLOAD	CL_GUI_FRONTEND_SERVICES
WS_DOWNLOAD	CL_GUI_FRONTEND_SERVICES
WS_EXECUTE	CL_GUI_FRONTEND_SERVICES
WS_FILENAME_GET	CL_GUI_FRONTEND_SERVICES
WS_FILE_ATTRIB	CL_GUI_FRONTEND_SERVICES
WS_FILE_COPY	CL_GUI_FRONTEND_SERVICES
WS_FILE_DELETE	CL_GUI_FRONTEND_SERVICES
WS_QUERY	CL_GUI_FRONTEND_SERVICES
WS_UPLOAD	CL_GUI_FRONTEND_SERVICES

Related Rules

• Avoid Obsolete CALL METHOD — #EC NO_CALL_METHOD
• Prefer Class-Based Exceptions over Classic EXCEPTIONS — #EC PREF_CLASS_EXC
• Avoid Obsolete Control Flow and Procedural Forms — #EC NO_OBS_CONTROL

Technical Details

• Native ATC Class: ZCL_SKYLINT_PREF_FUNC_MODULE
• Implementation File: zcl_skylint_pref_func_module.clas.abap