sap-abap

1. Environment Detection

Ask before writing any code:

□ ABAP release? (7.02 ECC / 7.40 / 7.50 / 7.57 S/4HANA 2023)
□ Clean Core required? (on-premise CBO allowed vs BTP side-by-side only?)
□ Package / naming convention? (Z* / Y* prefix, package structure)
□ Transport landscape? (DEV → QAS → PRD, how many systems?)
□ S/4HANA deployment? (on-premise / RISE / Cloud PE — affects what's allowed)

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2. Enhancement Framework — Decision Table

Scenario	Recommended Approach	Notes
Classic user exit exists	SMOD / CMOD	ECC only — avoid in new S/4HANA dev
BAdI definition exists	New BAdI (SE19 / GET BADI)	All releases — preferred approach
No exit/BAdI, on-premise	Enhancement Spot (SE18/SE19)	CBO allowed on-premise
S/4HANA Clean Core / Cloud PE	BTP side-by-side extension (RAP + Events)	No on-stack modifications

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3. Code Patterns with Full Examples

New BAdI (All Releases — Preferred)

" Step 1: Find BAdI via SE19 or BADI Explorer (SPRO)
" Step 2: Create enhancement implementation
" Step 3: Implement interface method

DATA lo_badi TYPE REF TO badi_name.
GET BADI lo_badi.
CALL BADI lo_badi->method_name
  EXPORTING iv_input  = lv_value
  IMPORTING ev_output = lv_result.

ALV — OO Approach (Recommended Over REUSE_ALV_GRID_DISPLAY)

DATA: lo_alv    TYPE REF TO cl_salv_table,
      lt_result TYPE TABLE OF your_structure.

" ... populate lt_result ...

TRY.
    cl_salv_table=>factory(
      IMPORTING r_salv_table = lo_alv
      CHANGING  t_table      = lt_result ).

    " Optional: configure columns
    lo_alv->get_columns( )->set_optimize( abap_true ).

    " Optional: add sort
    DATA(lo_sorts) = lo_alv->get_sorts( ).
    lo_sorts->add_sort( columnname = 'FIELD1' ).

    lo_alv->display( ).
  CATCH cx_salv_msg INTO DATA(lx_err).
    MESSAGE lx_err->get_text( ) TYPE 'E'.
ENDTRY.

BAPI with Complete Error Handling

DATA lt_return TYPE TABLE OF bapiret2.

CALL FUNCTION 'BAPI_NAME'
  EXPORTING
    iv_param1 = lv_value1
    iv_param2 = lv_value2
  IMPORTING
    ev_result = lv_result
  TABLES
    return    = lt_return.

" ALWAYS check return table — never assume success
IF line_exists( lt_return[ type = 'E' ] )
OR line_exists( lt_return[ type = 'A' ] ).
  " Error — do NOT commit; handle or raise
  LOOP AT lt_return INTO DATA(ls_err) WHERE type CA 'EA'.
    MESSAGE ls_err-message TYPE 'E'.
  ENDLOOP.
ELSE.
  " Success — commit
  CALL FUNCTION 'BAPI_TRANSACTION_COMMIT'
    EXPORTING wait = abap_true.
ENDIF.