ALV tree - change node text

hello,

on a screen I have input fields such as year and below a container holding an ALV tree.

When I change the year value, that starts a new selection from a table and should result in changing many of the lines in the tree.

I was trying to use the methods "get_outtab_line" to retrieve the tree line data and then changing this data with method "change_node".

The problem is I cannot access the correct node-key. The node-key value is kept in memory somewhere and when I refresh the alv tree at PBO, the node-key is incremented from the stored value which means I cannot use get_outtab_line properly.

Any suggestions or example programs,

Thanks a lot,

Kevin