Take a payment in two clicks, with honest arithmetic on partial sums, excesses and shortfalls.

A payment is posted from the deal card or from the shared register. The system offers the full amount itself and spreads a partial one down the schedule in a cascade: it closes the nearest unpaid payment, carries the remainder to the next one, and so on until the money runs out.
Small change does not get in the way: a shortfall of up to 10 ₽ is recognised as paid off by the system itself — otherwise the deal would hang open because of rounding, and the cashier would be looking for who owes a rouble.
A mistaken payment is not erased but reversed, with a reason required. Both entries stay in the journal: the receipt and its reversal. That is how the cash desk balance always agrees with its history, and any figure can be explained.

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