[Zope] REQUEST object

Hello. In my DTML document I set a temporary variable called 'price' to 0 using the following statement: <dtml-call "REQUEST.set('priceNumber', 0)"> Then, I try to access this variable in my DTML method by using the following: <dtml-var "REQUEST.get('priceNumber')"> and 'None' is echoed. I have also tried printing the entire REQUEST object using the following: <dtml-var name="REQUEST"> and this variable is not found in the list of variables mentioned. The suprising part is that I have tried the same thing with another variable called 'degreeNumber' and everything works just fine. I don't think it's a naming issue since I have tried serveral other names. Any help would be greatly appreciated. Thanks. - Asad