With the 12.0.0.0 Windchill release, we will no longer be supporting Classic Plans in ProjectLink. If you currently have any Projects based upon Classic planning mode you should be working on plans to covert these to EPP mode prior to moving to a 12.x stream. We have made available tools available to evaluate what Projects you have based upon Classic mode as well as improved tools to convert to the EPP mode.
Please see links below for more details:
Support Site Bulletin: https://www.ptc.com/en/support/alerts/windchill_classic_plan_deprecation_12
TS Article: https://www.ptc.com/en/support/article/CS319824
