Final states within an activity diagram

I have come to realisation that within an activity diagram it should be possible that there are 2 (or more than one) final states.

This is because the client (agency) has noted that the vendor or the buyer can pull out the transaction or process throughout most of the case study.

therefore there should be a final state where the vendor or buyer has changed their decision to buy or sell.

isn't that how it should be?