Choose function with parameters (1 Viewer)

I'm really hoping someone can help me, I can not figure out what I'm doing wrong, I have query set up as such:

UMMonth1: Choose([Enter Qtr],[OperationsAuditData]![1],[OperationsAuditData]![4],[OperationsAuditData]![7],[OperationsAuditData]![10])

But I keep getting an error message "You tried to execute a query that does not include "UMMonth1: Choose([Enter Qtr],[OperationsAuditData]![1],[OperationsAuditData]![4],[OperationsAuditData]![7],[OperationsAuditData]![10])' as part of an aggregate function."

Please post your entire query.
For more info on Choose function see

Aggregate functions are those that appear in the drop down list on the Totals row in the design grid, if one column contains one of these then all columns must , presumably Choose is not one.

Brian