Number to Word in BI Publisher word template rtf

Please, if anyone can assist.

I am trying to convert a subtotal field in BI Publisher Word template Rtf from number to word but the output shows number only. I have tried these 2 syntax and they both do not
work.

Total Amount in Words:
<?xdoxslt:toWordsAmt(TOTALAMT, ‘INR’,'CASE_UPPER', 'DECIMAL_STYLE_WORDS')?>

Total Amount in Words:
<?xdofx:to_check_number(TOTALAMT, ‘INR’,'CASE_UPPER', 'DECIMAL_STYLE_WORDS')?>

*TOTALAMT is a calculated field.

But if I used this syntax in the rtf - it works OK

Total Amount in Words: <?xdoxslt:toWordsAmt(250000, ‘INR’,'CASE_UPPER', 'DECIMAL_STYLE_WORDS')?>

i.e. I manually put in the AMOUNT (in number)