WORKING WITH BOM EXPLOSION FUNCTION MODULE(CS_BOM_EXPL_MAT_V2)

Here You will get the BOM(Bill of Material) details using Function Module.
Function Module Name : CS_BOM_EXPL_MAT_V2

Example:

CALL FUNCTION 'CS_BOM_EXPL_MAT_V2'
      EXPORTING
        AUSKZ                 = 'X'
        CAPID                 = 'PP01'
        DATUV                 =  SY-DATUM    "DATE
        EHNDL                 = '1'
        EMENG                 = IM_YIELD     "Pass Quantity
        MKTLS                 = 'X'
        MMORY                 = '1'
        MTNRV                 = IM_MATERIAL  "Pass Material
        STPST                 = 0
        SVWVO                 = 'X'
        WERKS                 = IM_PLANT     "Pass Plant
        VRSVO                 = 'X'
      TABLES
        STB                   = EX_STB
        MATCAT                = EX_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. 

You will get the BOM Details in EX_MATCAT.