HELP ON DMEE EXIT MODULE

Hi,
I have a requirement to convert the value in the AMOUNT field based on the content of a field RESERVED in the file. So I have deifined an exit module in the Mapping tab of the Amount field which is of the form
DMEE_EXIT_TEMPLATE_IN_MAPPING. However, the export parameter E_VALUE has the value when it leaves the FM but in the end when I generaete the file. I see no value in the file. I.e. I get empty spaces. Ideally there should be negative amount in the file.
Can someone counsel me in this regard please.
The code in the function module is as below
FUNCTION z_fi_dmee_exit_mapping_amountx.
""Local interface:
*" IMPORTING
*"     REFERENCE(I_INTERFACE) TYPE DMEE_EXIT_INTERFACE_INCOMING
*" EXPORTING
*"     REFERENCE(E_VALUE)
Data : ls_amount(20) type n.
IF i_interface-file_line+1064(1) = '0'.
    ls_amount = i_interface-file_line+773(20).
    ls_amount = ls_amount * -1.
    e_value = ls_amount.
ENDIF.
Cheers,
Amber

in ur program, ur calling this FM and may be u have specified another field name in the export parameter. This field will hold the value returned from the FM. you need to use this field while generation of data.

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Tell me ur mailid. I will sen u more.
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