NLS_NUMERIC_CHARACTERS environment variable not working.

I have also posted this question in the reports community, but hoping to have a wider audienace ion this community.

Converting an Oracle report from 11i to R12 in EBS.  The report utilizes the following: 

srw.reference(:Invoice_Amt);
srw.reference(:Currency_Code);
:RP_DATA_FOUND := :customer_name;
srw.user_exit('FND FORMAT_CURRENCY
               CODE=":Currency_Code"
               DISPLAY_WIDTH="13"
               AMOUNT=":Invoice_amt"
               DISPLAY=":D_Invoice_Amount"');

The log displays the following messages.  I added MSG-00111 for debugging purposes:

Forcing NLS_NUMERIC_CHARACTERS to: '.,' for XDO processing

 APPLLCSP Environment Variable set to :

 Current NLS_LANG and NLS_NUMERIC_CHARACTERS Environment Variables are :