Everything is normal so far.

The second form has also Business Object A (another instance). These two instance share the same datatable. The selected object (current row) is updated by this instance. After returning back, I see that the current record in the grid is also changed.

I repeat the above functionality. (Change the condition)But  I 've found that my grid was not refreshed. Business Object A is filled with the new query. (Grid size changes)  But current view does not change.