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Samo Arko
4/11/19, 3:11 AM

This just can't be done with the write method. Had to disable moving  the task to certain stages with the @api.constrain('stage_id'). And allow to move to them only with a button. The button then executes a query.

self.env.cr.execute('UPDATE project_task '
                    'SET stage_id = %(stage_id)s, locked = TRUE, write_date = %(write_date)s '
                    'WHERE id IN %(task_id)s ', ({'stage_id': stage_id, 'task_id': tuple(task_ids), 'write_date': write_timestamp}))

After that I just check the locked field in the write method

if self.locked:
	raise ValidationError(_(u'Task cannot be changed!'))
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