Referencing data elements from different query 8.4

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Hi Guys:
    We are in the process of migrating reports to 8.4 from 8.2. I was wondering if any one had any insight into referencing data elements from other queries in filters. In 8.2 this was acceptable and the crosstab worked fine, however in 8.4 I am getting an error, something to the effect that certain elements in the joined query do not exist, when they clearly do. These queries are referencing data elements from other queries in their filters. Would you know if there a workaround for this?
Thanks
Ronny