Tryton, form state change with Eval not working with custom field (+ fix)

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I added a Boolean field to SaleLine - one that is not shown to the user but only set in the code as a flag. As the readonly state of just about all my custom fields should depend on that I added:

states = {'readonly': ((Eval('sale_state') != 'draft') |
                 Eval('real_product')), 
 }, 

Frustratingly it did not work even though the rest of my code was executed in on_change_product as was seen on the assignment of values.

Took me a while to figure out what the problem was .. apparently for Eval('real_product') to work I needed to add this field to my sale_line_form.xml. So I did just that and to not show it to the user of course added states = { 'invisible': True, } to my Boolean field. Simple when you know it .. but takes a while to figure out if you don't.

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