eBay's reasonable cancellation of transactions means that in some cases, the buyer and seller can negotiate to cancel the transaction without violating eBay's platform policies.

The following are some common reasonable cancellation of transactions:

1. The buyer cannot pay the order: If the buyer cannot pay the order for some reason, he can contact the seller to cancel the transaction to avoid disputes and avoid the risk of accumulating unpaid orders in his account on Bay.

2. The seller cannot ship: If the seller finds that he cannot ship the goods as promised, he can negotiate with the buyer to cancel the transaction. If the seller cannot ship the goods for various reasons, the goods are out of stock or cannot be delivered to the buyer's area, the transaction can also be cancelled by reasonable communication with the buyer.

3. Both parties negotiate to cancel the transaction: If there are unavoidable problems, such as inaccurate product descriptions or poor communication between the two parties, you can also contact the other party as soon as possible and negotiate to cancel the transaction to avoid subsequent returns, refunds and other issues.

It should be noted that if both parties to the transaction frequently cancel the transaction without reasonable reasons, it may affect the account credit rating or violate the relevant regulations of the eBay platform. Therefore, when deciding to cancel a transaction, it is recommended to first check the relevant regulations of the eBay platform and communicate reasonably with the transaction partner.