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Rounding 
When you give a customer a discount, the price per item has to be rounded to the nearest groszy. The system does this automatically, and posts the rounding differences to a profit and loss account.
A customer places a sales order for 70 sections of pipe at PLN 10.73 each. Since the customer often buys from you, you give it a discount of PLN 50. That means that the customer has to pay PLN 701.10 (before tax):

However, after the discount, the price per pipe section is PLN 10.0157, rounded to four decimal places (PLN 701.10 ÷ 70). The system automatically rounds this amount up to the nearest groszy, PLN 10.02. That makes a difference per section of approximately PLN 0.043, which gives a total difference of PLN 0.30. When you post the invoice to Financial Accounting (FI), it therefore looks like this:

