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1. If the payment method is any of these:  "exchange", "wine_bank_interest", "promotional_credit" we do not want to show the payment in the payment table.
2. Tax rules for discounts:

   1. sales
      goods_discount_inc_tax includes promotional_credit amount
      goods_discount_tax includes promotional_credit tax amount
      promotional_credit amount is subtracted from the goods_net_inc_tax 
      promotional_credit tax amount is subtracted from the goods_tax

   2. sales_payment
      No entry for the promotional_credit amount in the sales payment table

Preorders

Preorders have some specific rules to follow.

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