Error Message : The query contain a reference to an object that does not exist

[nirre]

Hi,
I have a strange issue in the report studio 8.4 .
One of my queries (q1) has a filter that within I use a reference to another query (q2).
I have double checked that the referenced query exists and running, however when I try to run a crosstab based on q1 an error message is issued : The query contains a reference to an object that does not exist.
This issue exists only when I use a crosstab, for example when I use a list the issue is gone.
any suggestions ?
kind regards, Nir

[KLeonard1]

Make sure this "missing" data item is not being referenced anywhere else in the report such as the Grouping/Sorting area.