How to go back to a particular item of the preivous block

Hi,
In the pre-block trigger, how to navigate back to a particular item of the preivous block? I've tried go_item('block1.item2'), but it only goes to :system.cursor_item. What if the system cursor item is not item2, how can go back to item2?
Vanessa

Have you try this,
go_block('block1');
go_item ('block1.item2');

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