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Rafael Reuber Brasile
26/02/14, 20:51

Try this. This will show a popup message.

def testError(self, cr, uid, ids, context=None):
    for line in self.browse(cr, uid, ids, context=context):
        if line.invoiced:
            warning = { 'title': 'Warning!', 'message' : 'Invalid action!'}
            return {'warning': warning}
    return self.write(cr, uid, ids, {'state': 'draft'})
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