How to filter using aggregate funtion

I want to display a subtotal footer row in a group, only if the group has 2 or more rows.

However, when I try adding a filter expression of: Total.count(null, "My Group") I get told:
org.eclipse.birt.report.engine.api.EngineException: Invalid Javascript expression: Total.count(null, "My Group") > 1.
Aggregate function call is not expected in this expression.

Can anybody suggest a workaround?

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Tianli

Please see attached report, I suggest you to use Aggregation builder instead of Total expression. Total.count(null, "My Group") is considered as a invalid expression and Total.count(true, "My Group") can work.

ninkibah

Tianli, 
sadly your example just shows using the Aggregate. I want to filter out the aggregate when I only have a single row in my group. BIRT checks that the filter expression does not contain aggregate expressions (e.g. Total.count) at the same level. 
 
I am now considering getting the group object, and setting a field to zero on the group header, and then for each group detail row, I increment the count. Then I can check this count in the group footer. 
 
I got these ideas from reading these BIRT docs: <a class='bbc_url' href='http://www.eclipse.org/birt/phoenix/ref/'>BIRT Technical Reference</a> 
But I think this is quite old documentation, so it may not be valid.

ninkibah

I finally found a solution. I set the visibility of the cell based on the expression. This works fine for me. I could not find a way to filter based on an aggregate expression.

I also tried hiding the complete row, and leaving the cells alone, but that didn't work.