Problem is solved..
Pass the
read table it_item into wa_item with key int_num = wa_mara-int_num.
if wa_item-meinh is not initial.
translate wa_item-meinh to upper case.
call function 'CONVERSION_EXIT_CUNIT_INPUT'
exporting
input = wa_item-meinh
language = sy-langu
importing
output = lwa_clientdata-po_unit
exceptions
unit_not_found = 1
others = 2.
lwa_clientdata-po_unit = lwa_clientdata-po_unit.
lwa_clientdata-po_unit_iso = lwa_clientdata-po_unit.
endif.
lwa_clientdatax-po_unit = lc_x.
lwa_clientdatax-po_unit_iso = lc_x.
Thanks every one