exchange rate table in doc_change_badi

Hi Experts,

I have a custom requirement to populate the currency (exchange rate table) section by default with the values from the custom table

in Bidder Tab of RFX.I tried to populate the et_exchrate table(exporting parameter) with the currencies from the custom table in

BBP_DOC_CHANGE_BADI implementation as below.

If IV_MODE = ‘C’,

Then in the ET_EXCHRATE table, populate multiple currencies maintained In the custom table, for each currency add the following row:-

GUID = get_exchange_rates

        IMPORTING

          et_exchrate          = lt_pdo_exr

          es_header            = ms_pdo_header_curr

          eo_meta_data_handler = mo_meta_data_consumer

        CHANGING

          co_message_handler   = mo_pdo_message_consumer.

Could anyone please help me why the exchange rates which are changed using doc_change_badi is not received in the above method?

Could anyone also please tell me how to enhance the refresh method?If i try to enhance the refresh method,i am getting few errors

such as facade object not found.Is there a way to enhance the refresh method?

Thanks in advance,

Rohini