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When you return the money on the e-wallet, the refund amount shouldn't exceed the current day balance of the merchant on the corresponding e-wallet (the total amount of successful payments minus the commission of the bank, minus the total amount of successful returns). If the cancel operation can't be performed it is denied with the error code 5 - 108 returned in the "Result" field and details for the error are "The amount of cancellation is more than merchant turnover for the current day". In this case, you can try cancel again later or at the end of the day, when you will have a sufficient amount of successful payments.
Partial cancellations on e-wallets (partial and full cancellations on QIWI) are prohibited during the calendar day (according to the time zone of Moscow).