Convert Numbers to Words in Report Writer GP 10

Dear 

I am using GP 10 , and trying to use the RW_ConvertToWordsAndNumbers() in the Purchase Order report, 

i am using the following syntax and i am still getting Wrong when i am generating the report ,

Function Script( RW_ConvertToWordsAndNumbers(POP_PO.Currency ID cyPrintTotal 0 )

am i missing something ?

Your feedback is appreciated