Sort GridControl modeled with parameterized query (bug?)

Question

I am using JDev 3.2.3. I created a ViewObject in expert mode which contained a parameterized query:
select emp_name, salary
from employees
where
dept_no = :1
Then, through a few workarounds, I managed to create a BC4J data form containing a GridControl linked to the ViewObject.
Cleared the associated empsRowSetInfo.queryOnOpen(false).
Created a button with action event:
empsRowSetInfo.setQueryConditionParams(new Object[] {
deptId
empsRowSetInfo.executeQuery();
This all works fine.
***The problem***
If you press on a header to re-sort the grid, a bad sql query error is thrown and details shows the following bad query:
select * from (
select emp_name, salary
from employees
where
dept_no = :1)
order by asc emp_name
ORA-00904: invalid column name
The GridControl headers appear to be getting their own copy of the ViewObject's query, then misinterpretting it. This works fine for non-parameterized queries since the column names are explicit. However :1 is not a column name but a place holder in my parameterized query.
Shouldn't the headers be using the same mechanism to sort the grid as used to populate the grid model originally?
Any suggestions for a workaround? Pressing a column header fatally breaks the form. Pressing the button again to re-execute the original query continues to throw the error!
Thanks,

Answer 1

This is clearly a bug.
DAC is in 9.0.2 + replaced by JClient.
It might be hard to get a fix for this problem.
As far as a workaround.
You can provide your own SortDelegate.
Start with diagnosing the problem by extracting the SortDelegate class out of 'dacf-src.zip'.
Change it into a mySortDelegate.java.
Set the sortDelegate property on the gridControl. (use an instance of mySortDelegate).
You should be able to step into your implementation and see what the problem is.
Hopefully you will be able to fix the problem in your sortDelegate class.