Convert material unit

Use FM MD_CONVERT_MATERIAL_UNIT

  CALL FUNCTION 'MD_CONVERT_MATERIAL_UNIT'
    EXPORTING
      i_matnr              = lv_matnr
      i_in_me              = 'PCE'
      i_out_me             = 'PAL'
      i_menge              = lv_qte
    IMPORTING
      e_menge              = lv_nbpal
    EXCEPTIONS
      error_in_application = 1
      OTHERS               = 2.