Error in Open Dataset. Application server file shows null value .

Dear Gurus,
As with my previous problem, I am now getting value from SAP Directory in AL11. But problem is-
1. When I try to get Quantity or Currency field, it shows runtime error while uploading in App. Server.  So, I used Char data type variable  to store currency field and concatenate these in a string type variable.
LOOP AT it_mseg INTO wa.
          move it_mseg-erfmg to amount.   " amount is a char type variable.
         CONCATENATE it_mseg-mblnr it_mseg-mjahr it_mseg-matnr amount it_mseg-werks it_mseg-lgort INTO ld_string.
  TRANSFER ld_string to filename.
But I am getting only 0 for all the records. If I directly transfer wa to filename, it shows values. But when i am passing string, all value shows 0. Plz give me solution.
Thanks,
With regards,
Tripod.

Hi,
use
WRITE it_mseg-erfmg to amount.
or, assuming that the currency is WW_WAERS,
WRITE it_mseg-erfmg CURRENCY WW_WAERS to amount.

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