I'm trying to create, what I thought would be a simple script:

When a sales order goes into edit mode, grab system notes, if field "Printed Picking Ticket" is True, popup an alert notifying the user that the pick ticket has been printed. (So they don't make changes to the order without notifying the warehouse).

I can't figure out how to grab information from the system notes, though. I run into a wall right away, since I can't see how a join to system notes is made:

var filters = [new nlobjSearchFilter('type',null,'anyof','SalesOrd'),
                       new nlobjSearchFilter('systemnotes',??????????, is','T')];