CodeTheta

In SAP we can use BOM Explosion using below function module, we need to pass some important parameter. 

CAPID - BOM Application ID (BEST).
EMENG - Required Quantity.
MTNRV - Material.
STLAL - Alternative BOM.
STLAN - BOM Usage.
WERKS - Plant.

we can find the multilevel BOM in STB table.

Code Snippet:

CALL FUNCTION 'CS_BOM_EXPL_MAT_V2'
    EXPORTING
        alekz = 'X'
        capid = p_capid
        datuv = sy-datum
        emeng = p_emeng
        mktls = 'X'
        mehrs = 'X'
        mtnrv = lv_matnr
        stlal = lv_stlal
        stlan = lv_stlan
        stpst = 0
        svwvo = 'X'
        werks = lv_werks
        vrsvo = 'X'
    TABLES
        stb = it_stb
        matcat = it_matcat
    EXCEPTIONS
        alt_not_found = 1
        call_invalid = 2
        material_not_found = 3
        missing_authorization = 4
        no_bom_found = 5
        no_plant_data = 6
        no_suitable_bom_found = 7
        conversion_error = 8
        OTHERS = 9.
    IF sy-subrc <> 0.
    ENDIF.

IDE Used To Test This Code : SAP GUI.

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