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'number': lambda *a: 16, # Because of 15 period in MSF, no period would use 16 number.
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def button_overdue_invoice(self, cr, uid, ids, context={}):
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def button_overdue_invoice(self, cr, uid, ids, context=None):
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Open a view that display overdue invoices for this period
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if isinstance(ids, (int, long)):