Extension function error: Method not found 'round'

Greetings everyone,

Has anyone out there ever run into the "Extension function error: Method not found 'round'" Issue when trying to use the round function?

I am using the following code:

<?xdoxslt:round(xdoxslt:div( xdoxslt:get_variable($_XDOCTX, 'tax_line_amt'),xdoxslt:to_number(LINE_AMOUNT)),4)?>

and it works perfectly in the template on my desktop, but when I implement it in Oracle EBS the process errors out.

I saw some really old post about this happening to a couple of people who were using different versions of desktop publisher, but nothing about this when implemented in EBS.

Here is the error: