This does not mean that revenue invoices since February.But the revenue that we need a declaration that we issue receipts and tax invoice. Where there are 13, all in the month of December.
Money does not mean that the invoice from February , but we have to file income tax from that issue receipts and invoices. In December, a total of 13 cards.
Money does not mean that the invoices from February but income we must submit tax, of which we issue a receipt and tax invoice? In December are all 13 leaves.