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Result of cancellation on payments via WebMoney becomes known in some time (usually - a few minutes). The order status doesn't changes immediately after the operation, the "Result" field indicates status Approved or PartialCanceled (if you have already canceled a part of the order amount) and the cancel operation in order details will be in the state "In process". Status of the cancel operation will be upgraded after a few minutes.
Result of cancellation on QIWI payment can be delayed (in some cases) similar to the results' delay for WebMoney cancellation.