Why the formular in text box can't work ?

[Martin \(Martin Lee\)]

I have [text9] which is a text box in a form.

I enter into [text9] the following formular, can't work :

=Round(Pmt([Text7],[Text5],[Text1],0,0),2)

However, after I transformed [text7], [text5] and [text1] into their box
value (pls refer to the below formular), it works!

=Round(Pmt(0.007,36,-100000,0,0),2)


Is there any method to make the first formular available?

Thanks!

Martin
2008-2-13