Crosstab error

From: George Schneider (anonymous_at_discussions.microsoft.com)
Date: 04/29/04 

Date: Thu, 29 Apr 2004 08:31:11 -0700

I have a form where you select the category. In the main query I have the criteria for the category field set to [Forms]![Main]![Combo0]. This works fine in the main query. I'm trying to create a crosstab query with this category filed as a value for one of the rows and get an error saying the microsoft jet database engine does not reconizw forms!main!combo0 as a valid field name. Why is this.