Problem with ToWords function

I using this piece of code in a formula field for diplaying the amount in words (In indian Currency).. its giving "Rupees One Crore one lakh negative fifty-three thousand six hundred fourty-four only" .. can anyone tell me y it is showing 'Negative' while using toWords??

(NOTE : In Indian Currency 10 Lakhs = 1 Million
and 10 Million = 1 Crore)


//--------------------------------------------------------------------------
whileprintingrecords;
numbervar RmVal:=0;
numbervar Amt:=0;
numbervar pAmt:=0;
stringvar InWords :="Rupees ";
Amt := 10046356; //{V_CARGO_BILL.TOTAL_AMT};
if Amt > 10000000 then
RmVal := truncate(Amt/10000000);
if RmVal = 1 then
InWords := InWords + " " + towords(RmVal,0) + " crore"
else if RmVal > 1 then
InWords := InWords + " " + towords(RmVal,0) + " crores";
Amt := Amt - Rmval * 10000000;
if Amt > 100000 then
RmVal := truncate(Amt/100000);
if RmVal = 1 then
InWords := InWords + " " + towords(RmVal,0) + " lakh"
else if RmVal > 1 then
InWords := InWords + " " + towords(RmVal,0) + " lakhs";
Amt := Amt - Rmval * 100000;
InWords := InWords + " " + towords(truncate(Amt),0);
pAmt := (Amt - truncate(Amt)) * 100;
if pAmt > 0 then
InWords := InWords + " " + towords(pAmt,0) + " paisa only"
else
InWords := InWords + " only";
InWords
//---------------------------------------------------------------------------

Had anyone tried this formula?? .. any ideas plz

whileprintingrecords;
numbervar RmVal:=0;
numbervar Amt:=0;
numbervar pAmt:=0;
stringvar InWords :="Rupees ";
Amt := Sum ({ERP_ENQUIRY_PRODUCT.dPrice}, {ERP_QUOTATION.nQuotationID}); //10046356;

if Amt >= 10000000 then RmVal := truncate(Amt/10000000);
if RmVal = 1 then
InWords := InWords + " " + towords(RmVal,0) + " crore"
else if RmVal > 1 then
InWords := InWords + " " + towords(RmVal,0) + " crores";

Amt := Amt - Rmval * 10000000;
RmVal:=0;

if Amt >= 100000 then RmVal := truncate(Amt/100000);
if RmVal = 1 then
InWords := InWords + " " + towords(RmVal,0) + " lakh"
else if RmVal > 1 then
InWords := InWords + " " + towords(RmVal,0) + " lakhs";

Amt := Amt - Rmval * 100000;
if truncate(Amt,0) > 0 then InWords := InWords + " " + towords(truncate(Amt),0);

pAmt := (Amt - truncate(Amt)) * 100;
if pAmt > 0 then
InWords := InWords + " and " + towords(pAmt,0) + " paisa only"
else
InWords := InWords + " only";

InWords