Indexing prices in Service Contracts

Hi all,

I'm running into the following issue at a customer. Every year on the 1st of January, the prices on service contracts should be indexated. However contracts can have any start date. This means we must be able to index contracts somewhere in between their start and end date. Is it possible to do some kind of mass reprice on active contracts without having to open every contract individually to reprice and change the billing schedule?

We are using advanced pricing to administer all prices.

The indexation process is as following:

Prices per contract line are valid from the 1st of January until the 31st of december of year t + x.