http://www.ca.com/us/support/ca-support-online/product-content/knowledgebase-articles/tec535858.aspx
If your project durations and/or forecasting extends beyond 2 years, you'll have an issue using Ideas. The slices used on the Team\Staff page are internal, not editable, and limited to 2 years into the future. I understand some customers, I'm guessing on-premise customers, have gotten this customized by CA to go out 3 years. The slice length is limited so that performance of these views is acceptable.
In IT environments, this might not be an issue. If you are in an NPD an environment with product durations exceeding 3 years, or your projects each are under 2 years duration but you need to plan out beyond 2 or 3 years, we will have to see what CA recommends. Perhaps staying in Project object, working with WBS, is required.