Hi!
In case of disagreement with a given rank after a transaction, the disagreeing party can issue a dispute. Businesses opening a dispute on the network have to provide enough PAN tokens to fuel the dispute by rewarding businesses invited to the resolution process. The amount of required tokens is summarized from a fixed amount and an amount relative to the estimated inquiry value. These tokens incentivize potential resolutioning businesses to join the resolution process.

You can read more about it in our whitepaper on page 22: https://mk0procureannetyd833.kinstacdn.com/app/uploads/2018/05/Procurean_WP-1.6_2018-05-23-1.pdf