AX 2012 segmented entry and group by

Hi

I created a table with LedgerDimension field among other fields. I build a form using a grid control to show this table. I used segmented entry to show account and dimensions. This form works correctly.

Now I want to show data grouped by account and dimensions.

I created a new data source, which include the same data as the first one, but I modified data source by using "group by" option in query in init method. I gruped by ledgerDimension.

Now my form shows bad data.

Only record with focus has correct data.

What is wrong? How to show data gruped by ledgerDimension?